"create a "create party" button, then a dropdown tween menu showing all parties in game, if I click it I join the party, it constantly shows how many players are in the party, maximum is 4, a start button that teleports all players in the party away"

-- LocalScript for "Create Party" button 
local button = script.Parent
local dropdown = script.Parent.Parent.DropDown
local player = game.Players.LocalPlayer
local partySystem = game.ReplicatedStorage.PartySystem

button.MouseButton1Click:Connect(function()
    partySystem.CreateParty:InvokeServer(player)
end)

-- LocalScript for dropdown menu 
local dropdown = script.Parent
local player = game.Players.LocalPlayer
local partySystem = game.ReplicatedStorage.PartySystem

local function updateParties()
    local parties = partySystem.GetParties:InvokeServer()
    dropdown:ClearAllChildren()

for _, party in ipairs(parties) do
        local partyButton = Instance.new("TextButton")
        partyButton.Text = "Party (" .. #party.members .. "/4)"
        partyButton.Size = UDim2.new(1, 0, 0, 30)
        partyButton.Parent = dropdown

partyButton.MouseButton1Click:Connect(function()
            if #party.members < 4 then
                partySystem.JoinParty:InvokeServer(player, party.id)
            end
        end)
    end
end

dropdown.MouseButton1Click:Connect(updateParties)

-- ServerScript for party system 
local partySystem = {}
local parties = {}

function partySystem.CreateParty(player)
    local partyId = #parties + 1
    local newParty = {
        id = partyId,
        leader = player,
        members = {player}
    }
    table.insert(parties, newParty)
end

function partySystem.GetParties()
    return parties
end

function partySystem.JoinParty(player, partyId)
    local party = parties[partyId]
    if party and #party.members < 4 then
        table.insert(party.members, player)
    end
end

game.ReplicatedStorage.PartySystem.OnServerInvoke = partySystem

-- LocalScript for "Start" button 
local startButton = script.Parent
local player = game.Players.LocalPlayer
local partySystem = game.ReplicatedStorage.PartySystem
local teleportService = game:GetService("TeleportService")
local gameId = 123456789 -- Replace with the actual game ID

startButton.MouseButton1Click:Connect(function()
    local playerParty = nil
    for _, party in ipairs(partySystem.GetParties:InvokeServer()) do
        if party.leader == player then
            playerParty = party
            break
        end
    end

if playerParty then
        local playerIds = {}
        for _, member in ipairs(playerParty.members) do
            table.insert(playerIds, member.UserId)
        end
        teleportService:TeleportPartyAsync(gameId, playerIds)
    end
end)