diff --git a/simmadome/src/CreateLeague.css b/simmadome/src/CreateLeague.css
index 5d6971b..58c3e36 100644
--- a/simmadome/src/CreateLeague.css
+++ b/simmadome/src/CreateLeague.css
@@ -27,6 +27,16 @@ input:focus {
 	outline: none;
 }
 
+input[type="number"] {
+  -webkit-appearance: textfield;
+     -moz-appearance: textfield;
+          appearance: textfield;
+}
+input[type=number]::-webkit-inner-spin-button, 
+input[type=number]::-webkit-outer-spin-button { 
+  -webkit-appearance: none;
+}
+
 .cl_league_main {
 	display: flex;
 	flex-direction: column;
@@ -36,7 +46,7 @@ input:focus {
 }
 
 .cl_league_name {
-	margin: 1rem;
+	margin-top: 1rem;
 }
 
 .cl_league_options, .cl_league_structure {
@@ -48,6 +58,10 @@ input:focus {
 	padding-top: 1.5rem;
 }
 
+.cl_league_options {
+	align-items: center;
+}
+
 .cl_league_structure, .cl_subleague_add_align {
 	display: flex;
 	align-items: center;
@@ -55,6 +69,10 @@ input:focus {
 	width: min-content;
 }
 
+.cl_league_structure {
+	margin-top: 1rem;
+}
+
 .cl_league_structure_table {
 	display: table;
 	margin-right: 1rem;
@@ -106,8 +124,8 @@ input:focus {
 	background: var(--background-main);
 	padding: 0.5rem 1rem;
 	margin: 0rem 0.5rem;
-	width: 22rem;
-	height:100%;
+	min-width: 22rem;
+	height: 100%;
 	box-sizing: border-box;
 }
 
@@ -116,6 +134,10 @@ input:focus {
 	margin-right: 0.5rem;
 }
 
+.cl_division_name_box {
+	width: 100%;
+}
+
 .cl_division_name {
 	margin-bottom: 0.5rem;
 	width: 95%;
@@ -145,7 +167,7 @@ input:focus {
 
 .cl_team_name {
 	font-size: 14pt;
-	padding-right: 0.5rem;
+	padding: 0 0.5rem;
 	overflow: hidden;
 	text-overflow: ellipsis;
 }
@@ -173,6 +195,58 @@ input:focus {
 	background: var(--background-main);
 }
 
+.cl_league_options {
+	padding: 1rem;
+	margin-top: 1.5rem;
+	width: 55rem;
+	box-sizing: border-box;
+}
+
+.cl_option_main {
+	display: flex;
+	flex-direction: row;
+	justify-content: space-around;
+	width: 100%;
+}
+
+.cl_option_submit_box {
+	display: flex;
+	flex-direction: column;
+	align-items: center;
+}
+
+.cl_option_box {
+	margin: 1rem;
+	width: max-content;
+}
+
+.cl_option_label, .cl_option_err, .cl_structure_err {
+	margin: 0.25rem;
+}
+
+.cl_option_err, .cl_structure_err {
+	color: var(--accent-red);
+}
+
+.cl_option_err {
+	min-height: 1.5rem;
+	margin-bottom: -0.5rem;
+	margin-top: 0.5rem;
+}
+
+.cl_structure_err {
+	margin-bottom: -0.5rem;
+}
+
+.cl_structure_err_div {
+	margin-top: -0.5rem;
+	margin-bottom: 0;
+}
+
+.cl_structure_err_teams {
+	width: 98%;
+}
+
 /* button styles */
 
 button > .emoji {
@@ -212,4 +286,16 @@ button > .emoji {
 
 .cl_delete_filler {
 	min-width: 3rem;
+}
+
+.cl_option_submit {
+	padding: 1rem 2rem;
+	height: 2rem;
+	border: none;
+	border-radius: 0.75rem;
+	display: flex;
+	align-items: center;
+	justify-content: center;
+	background: var(--accent-green);
+	font-size: 14pt;
 }
\ No newline at end of file
diff --git a/simmadome/src/CreateLeague.tsx b/simmadome/src/CreateLeague.tsx
index 5751f78..f0e4df6 100644
--- a/simmadome/src/CreateLeague.tsx
+++ b/simmadome/src/CreateLeague.tsx
@@ -2,28 +2,66 @@ import React, {useState, useRef, useLayoutEffect, useReducer} from 'react';
 import './CreateLeague.css';
 import twemoji from 'twemoji';
 
-interface LeagueStructureState {
+// STATE CLASSES
+
+class LeagueStructureState {
 	subleagues: SubleagueState[]
+
+	constructor(subleagues: SubleagueState[] = []) {
+		this.subleagues = subleagues;
+	}
 }
 
-interface SubleagueState {
+class SubleagueState {
 	name: string
-	id: string|number
 	divisions: DivisionState[]
+	id: string|number
+
+	constructor(divisions: DivisionState[] = []) {
+		this.name = "";
+		this.divisions = divisions;
+		this.id = getUID();
+	}
 }
 
-interface DivisionState {
+class DivisionState {
 	name: string
-	id: string|number
 	teams: TeamState[]
+	id: string|number
+
+	constructor() {
+		this.name = "";
+		this.teams = [];
+		this.id = getUID();
+	}
 }
 
-interface TeamState {
+class TeamState {
 	name: string
 	id: string|number
+
+	constructor(name: string = "") {
+		this.name = name;
+		this.id = getUID();
+	}
 }
 
-type LeagueReducerActions = 
+let getUID = function() { // does NOT generate UUIDs. Meant to create list keys ONLY
+	let id = 0;
+	return function() { return id++ }
+}()
+
+let initLeagueStructure = {
+	subleagues: [0, 1].map((val) => 
+		new SubleagueState([0, 1].map((val) => 
+			new DivisionState()
+		))
+	)
+};
+
+// STRUCTURE REDUCER
+
+type StructureReducerActions = 
 	{type: 'remove_subleague', subleague_index: number} |
 	{type: 'add_subleague'} |
 	{type: 'rename_subleague', subleague_index: number, name: string} |
@@ -33,70 +71,52 @@ type LeagueReducerActions =
 	{type: 'remove_team', subleague_index: number, division_index: number, name:string} |
 	{type: 'add_team', subleague_index:number, division_index:number, name:string}
 
-type DistributiveOmit<T, K extends keyof any> = T extends any ? Omit<T, K> : never;
-
-let getUID = function() { // does NOT generate UUIDs. Meant to create list keys ONLY
-	let id = 0;
-	return function() { return id++}
-}()
-
-function leagueStructureReducer(state: LeagueStructureState, action: LeagueReducerActions): LeagueStructureState {
+function leagueStructureReducer(state: LeagueStructureState, action: StructureReducerActions): LeagueStructureState {
 	switch (action.type) {
 	case 'remove_subleague':
 		return {subleagues: removeIndex(state.subleagues, action.subleague_index)};
 	case 'add_subleague':
-		return {subleagues: state.subleagues.concat([{
-			name: "", 
-			id: getUID(),
-			divisions: arrayOf(state.subleagues[0].divisions.length, i => ({
-				name: "",
-				id: getUID(),
-				teams: []
-			}))
-		}])};
+		return {subleagues: append(state.subleagues, new SubleagueState(
+			arrayOf(state.subleagues[0].divisions.length, i => 
+				new DivisionState()
+			)
+		))}
 	case 'rename_subleague':
-		return replaceSubleague(state, action.subleague_index, subleague => ({
-			name: action.name, 
-			id: subleague.id,
-			divisions: subleague.divisions
-		}));
+		return replaceSubleague(state, action.subleague_index, subleague => {
+			let nSubleague = shallowClone(subleague);
+			nSubleague.name = action.name;
+			return nSubleague;
+		});
 	case 'remove_divisions':
-		return {subleagues: state.subleagues.map(subleague => ({
-			name: subleague.name, 
-			id: subleague.id,
-			divisions: removeIndex(subleague.divisions, action.division_index)
-		}))};
+		return {subleagues: state.subleagues.map(subleague => {
+			let nSubleague = shallowClone(subleague);
+			nSubleague.divisions = removeIndex(subleague.divisions, action.division_index)
+			return nSubleague;
+		})};
 	case 'add_divisions':
-		return {subleagues: state.subleagues.map(subleague => ({
-			name: subleague.name,
-			id: subleague.id,
-			divisions: subleague.divisions.concat([{
-				name: "", 
-				id: getUID(),
-				teams: []
-			}])
-		}))};
+		return {subleagues: state.subleagues.map(subleague => {
+			let nSubleague = shallowClone(subleague);
+			nSubleague.divisions = append(subleague.divisions, new DivisionState())
+			return nSubleague;
+		})};
 	case 'rename_division':
-		return replaceDivision(state, action.subleague_index, action.division_index, division => ({
-			name: action.name,
-			id: division.id,
-			teams: division.teams
-		}));
+		return replaceDivision(state, action.subleague_index, action.division_index, division => {
+			let nDivision = shallowClone(division);
+			nDivision.name = action.name;
+			return nDivision; 
+		});
 	case 'remove_team':
-		return replaceDivision(state, action.subleague_index, action.division_index, division => ({
-			name: division.name,
-			id: division.id,
-			teams: removeIndex(division.teams, division.teams.findIndex(val => val.name === action.name))
-		}));
+		return replaceDivision(state, action.subleague_index, action.division_index, division => {
+			let nDivision = shallowClone(division);
+			nDivision.teams = removeIndex(division.teams, division.teams.findIndex(val => val.name === action.name));
+			return nDivision; 
+		});
 	case 'add_team':
-		return replaceDivision(state, action.subleague_index, action.division_index, division => ({
-			name: division.name,
-			id: division.id,
-			teams: division.teams.concat([{
-				name: action.name,
-				id: getUID()
-			}])
-		}));
+		return replaceDivision(state, action.subleague_index, action.division_index, division => {
+			let nDivision = shallowClone(division);
+			nDivision.teams = append(division.teams, new TeamState(action.name));
+			return nDivision;
+		});
 	}
 }
 
@@ -105,13 +125,15 @@ function replaceSubleague(state: LeagueStructureState, si: number, func: (val: S
 }
 
 function replaceDivision(state: LeagueStructureState, si: number, di: number, func:(val: DivisionState) => DivisionState) {
-	return replaceSubleague(state, si, subleague => ({
-		name: subleague.name,
-		id: subleague.id,
-		divisions: replaceIndex(subleague.divisions, di, func(subleague.divisions[di]))
-	}))
+	return replaceSubleague(state, si, subleague => {
+		let nSubleague = shallowClone(subleague);
+		nSubleague.divisions = replaceIndex(subleague.divisions, di, func(subleague.divisions[di]));
+		return nSubleague;
+	});
 }
 
+// UTIL
+
 function removeIndex(arr: any[], index: number) {
 	return arr.slice(0, index).concat(arr.slice(index+1));
 }
@@ -132,21 +154,22 @@ function arrayOf<T>(length: number, func: (i: number) => T): T[] {
 	return out;
 }
 
-let initLeagueStructure = {
-	subleagues: [0, 1].map((val) => ({
-		name: "",
-		id: getUID(),
-		divisions: [0, 1].map((val) => ({
-			name: "",
-			id: getUID(),
-			teams: []
-		}))
-	}))
+function shallowClone<T>(obj: T): T {
+	return Object.assign({}, obj);
 }
 
+type DistributiveOmit<T, K extends keyof any> = T extends any ? Omit<T, K> : never;
+
+// CREATE LEAGUE
+
 function CreateLeague() {
 	let [name, setName] = useState("");
+	let [showError, setShowError] = useState(false);
 	let [structure, dispatch] = useReducer(leagueStructureReducer, initLeagueStructure);
+	let gamesSeries = useState('3');
+	let seriesDivisionOpp = useState('8');
+	let seriesInterDivision = useState('16');
+	let seriesInterLeague = useState('8');
 
 	let self = useRef<HTMLDivElement | null>(null)
 
@@ -159,30 +182,115 @@ function CreateLeague() {
 	return (
 		<div className="cl_league_main" ref={self}>
 			<input type="text" className="cl_league_name" placeholder="League Name" value={name} onChange={(e) => setName(e.target.value)}/>
-			<LeagueStructre state={structure} dispatch={dispatch}/>
-			<LeagueOptions />
+			<div className="cl_structure_err">{name === "" && showError ? "A name is required." : ""}</div>
+			<LeagueStructre state={structure} dispatch={dispatch} showError={showError}/>
+			<div className="cl_league_options">
+				<LeagueOptions 
+					gamesSeries={gamesSeries} 
+					seriesDivisionOpp={seriesDivisionOpp} 
+					seriesInterDivision={seriesInterDivision} 
+					seriesInterLeague={seriesInterLeague}
+					showError={showError}
+				/>
+				<div className="cl_option_submit_box">
+					<button className="cl_option_submit" onClick={e => {
+						//make network call, once leagues are merged
+						if (!validRequest(name, structure, gamesSeries[0], seriesDivisionOpp[0], seriesInterDivision[0], seriesInterLeague[0])) {
+							setShowError(true);
+						}
+					}}>Submit</button>
+					<div className="cl_option_err">{
+						!validRequest(name, structure, gamesSeries[0], seriesDivisionOpp[0], seriesInterDivision[0], seriesInterLeague[0]) && showError ?
+						"Cannot create league. Some information is invalid." : ""
+					}</div>
+				</div>
+			</div>
 		</div>
 	);
 }
 
-function LeagueStructre(props: {state: LeagueStructureState, dispatch: React.Dispatch<LeagueReducerActions>}) {
+function makeRequest(
+		name:string, 
+		structure: LeagueStructureState, 
+		gamesPerSeries: string, 
+		divisionSeries: string, 
+		interDivisionSeries: string, 
+		interLeagueSeries: string
+	) {
+
+	if (!validRequest(name, structure, gamesPerSeries, divisionSeries, interDivisionSeries, interLeagueSeries)) { 
+		return null 
+	}
+	
+	return ({
+		structure: {
+			name: name,
+			subleagues: structure.subleagues.map(subleague => ({
+				name: subleague.name,
+				divisions: subleague.divisions.map(division => ({
+					name: division.name,
+					teams: division.teams
+				}))
+			}))
+		},
+		games_per_series: Number(gamesPerSeries),
+		division_series: Number(divisionSeries),
+		inter_division_series: Number(interDivisionSeries),
+		inter_league_series: Number(interLeagueSeries) 
+	});
+}
+
+function validRequest(
+		name:string, 
+		structure: LeagueStructureState, 
+		gamesPerSeries: string, 
+		divisionSeries: string, 
+		interDivisionSeries: string, 
+		interLeagueSeries: string
+	) {
+
+	return (
+		name !== "" && 
+		validNumber(gamesPerSeries) && 
+		validNumber(divisionSeries) && 
+		validNumber(interDivisionSeries) && 
+		validNumber(interLeagueSeries) &&
+		structure.subleagues.length % 2 === 0 &&
+		structure.subleagues.every(subleague => 
+			subleague.name !== "" &&
+			subleague.divisions.every(division => 
+				division.name !== "" &&
+				division.teams.length >= 2
+			)
+		)
+	)
+}
+
+function validNumber(value: string) {
+	return Number(value) !== NaN && Number(value) > 0
+}
+
+// LEAGUE STRUCUTRE
+
+function LeagueStructre(props: {state: LeagueStructureState, dispatch: React.Dispatch<StructureReducerActions>, showError: boolean}) {
 	return (
 		<div className="cl_league_structure">
 			<div className="cl_league_structure_scrollbox">
 				<div className="cl_subleague_add_align">
 					<div className="cl_league_structure_table">
-						<SubleagueHeaders subleagues={props.state.subleagues} dispatch={props.dispatch} />
-						<Divisions subleagues={props.state.subleagues} dispatch={props.dispatch} />
+						<SubleagueHeaders subleagues={props.state.subleagues} dispatch={props.dispatch} showError={props.showError}/>
+						<Divisions subleagues={props.state.subleagues} dispatch={props.dispatch} showError={props.showError}/>
 					</div>
 					<button className="cl_subleague_add" onClick={e => props.dispatch({type: 'add_subleague'})}>➕</button>
 				</div>
 			</div>
+			<div className="cl_structure_err">{props.state.subleagues.length % 2 !== 0 && props.showError ? "Must have an even number of subleagues." : ""}</div>
 			<button className="cl_division_add" onClick={e => props.dispatch({type: 'add_divisions'})}>➕</button>
 		</div>
 	);
 }
 
-function SubleagueHeaders(props: {subleagues: SubleagueState[], dispatch: React.Dispatch<LeagueReducerActions>}) {
+function SubleagueHeaders(props: {subleagues: SubleagueState[], dispatch: React.Dispatch<StructureReducerActions>, showError:boolean}) {
 	return (
 		<div className="cl_headers">
 			<div key="filler" className="cl_delete_filler"/> 
@@ -192,6 +300,7 @@ function SubleagueHeaders(props: {subleagues: SubleagueState[], dispatch: React.
 						<SubleageHeader state={subleague} canDelete={props.subleagues.length > 1} dispatch={action => 
 							props.dispatch(Object.assign({subleague_index: i}, action))
 						}/>
+						<div className="cl_structure_err">{subleague.name === "" && props.showError ? "A name is required." : ""}</div>
 					</div>
 				</div>
 			))}
@@ -199,7 +308,7 @@ function SubleagueHeaders(props: {subleagues: SubleagueState[], dispatch: React.
 	);
 }
 
-function SubleageHeader(props: {state: SubleagueState, canDelete: boolean, dispatch:(action: DistributiveOmit<LeagueReducerActions, 'subleague_index'>) => void}) {
+function SubleageHeader(props: {state: SubleagueState, canDelete: boolean, dispatch:(action: DistributiveOmit<StructureReducerActions, 'subleague_index'>) => void}) {
 	return (
 		<div className="cl_subleague_header">
 			<input type="text" className="cl_subleague_name" placeholder="Subleague Name" value={props.state.name} onChange={e => 
@@ -210,7 +319,7 @@ function SubleageHeader(props: {state: SubleagueState, canDelete: boolean, dispa
 	);
 }
 
-function Divisions(props: {subleagues: SubleagueState[], dispatch: React.Dispatch<LeagueReducerActions>}) {
+function Divisions(props: {subleagues: SubleagueState[], dispatch: React.Dispatch<StructureReducerActions>, showError: boolean}) {
 	return (<>
 		{props.subleagues[0].divisions.map((val, di) => (
 			<div key={val.id} className="cl_table_row">
@@ -225,7 +334,7 @@ function Divisions(props: {subleagues: SubleagueState[], dispatch: React.Dispatc
 						<div className="cl_subleague_bg">
 							<Division state={subleague.divisions[di]} dispatch={action =>
 								props.dispatch(Object.assign({subleague_index: si, division_index: di}, action))
-							}/>
+							} showError={props.showError}/>
 						</div>
 					</div>
 				))}
@@ -234,7 +343,7 @@ function Divisions(props: {subleagues: SubleagueState[], dispatch: React.Dispatc
 	</>);
 }
 
-function Division(props: {state: DivisionState, dispatch:(action: DistributiveOmit<LeagueReducerActions, 'subleague_index'|'division_index'>) => void}) {
+function Division(props: {state: DivisionState, dispatch:(action: DistributiveOmit<StructureReducerActions, 'subleague_index'|'division_index'>) => void, showError:boolean}) {
 	let [newName, setNewName] = useState("");
 	let [searchResults, setSearchResults] = useState<string[]>([]);
 	let newNameInput = useRef<HTMLInputElement>(null);
@@ -248,10 +357,11 @@ function Division(props: {state: DivisionState, dispatch:(action: DistributiveOm
 
 	return (
 		<div className="cl_division">
-			<div>
+			<div className="cl_division_name_box">
 				<input type="text" className="cl_division_name" placeholder="Division Name" key="input" value={props.state.name} onChange={e => 
 					props.dispatch({type: 'rename_division', name: e.target.value})
 				}/>
+				<div className="cl_structure_err cl_structure_err_div">{props.state.name === "" && props.showError ? "A name is required." : ""}</div>
 			</div>
 			{props.state.teams.map((team, i) => (
 				<div className="cl_team" key={team.id}>
@@ -283,14 +393,48 @@ function Division(props: {state: DivisionState, dispatch:(action: DistributiveOm
 				</div>): 
 				<div/>
 			}
+			<div className="cl_structure_err cl_structure_err_teams">{props.state.teams.length < 2 && props.showError ? "Must have at least 2 teams." : ""}</div>
 		</div>
 	);
 }
 
-function LeagueOptions() {
-	return (
-		<div className="cl_league_options">
+// LEAGUE OPTIONS
 
+type StateBundle<T> = [T, React.Dispatch<React.SetStateAction<T>>]
+
+function LeagueOptions(props: {
+		gamesSeries: StateBundle<string>, 
+		seriesDivisionOpp: StateBundle<string>, 
+		seriesInterDivision: StateBundle<string>, 
+		seriesInterLeague: StateBundle<string>,
+		showError: boolean
+	}) {
+
+	let [nGamesSeries, setGamesSeries] = props.gamesSeries;
+	let [nSeriesDivisionOpp, setSeriesDivisionOpp] = props.seriesDivisionOpp;
+	let [nSeriesInterDivision, setSeriesInterDivision] = props.seriesInterDivision;
+	let [nSeriesInterLeague, setSeriesInterLeague] = props.seriesInterLeague;
+
+	return (
+		<div className="cl_option_main">
+			<div className="cl_option_column">
+				<NumberInput title="Number of games per series" value={nGamesSeries} setValue={setGamesSeries} showError={props.showError}/>
+				<NumberInput title="Number of series with each division opponent" value={nSeriesDivisionOpp} setValue={setSeriesDivisionOpp} showError={props.showError}/>
+			</div>
+			<div className="cl_option_column">
+				<NumberInput title="Number of inter-divisional series" value={nSeriesInterDivision} setValue={setSeriesInterDivision} showError={props.showError}/>
+				<NumberInput title="Number of inter-league series" value={nSeriesInterLeague} setValue={setSeriesInterLeague} showError={props.showError}/>
+			</div>
+		</div>
+	);
+}
+
+function NumberInput(props: {title: string, value: string, setValue: (newVal: string) => void, showError: boolean}) {
+	return (
+		<div className="cl_option_box">
+			<div className="cl_option_label">{props.title}</div>
+			<input className="cl_option_input" type="number" min="0" value={props.value} onChange={e => props.setValue(e.target.value)}/>
+			<div className="cl_option_err">{(Number(props.value) === NaN || Number(props.value) < 0) && props.showError ? "Must be a number greater than 0" : ""}</div>
 		</div>
 	);
 }