How to Make Camping Game Teleport [Lobby -> Game]?

Hey There,

So i want to make a simple camping type game

But i still confused about

How you teleport player to another place?

Like, if the game already running nobody can join it.

And i also found this,

TeleportService = game:GetService("TeleportService")
GamePlaceId = 12345

function StartGameServerWithGroup(players)
    local accessCode, serverId = TeleportService:ReserveServer(GamePlaceId)
    
    TeleportService:TeleportToPrivateServer(GamePlaceId, accessCode, players)
end

StartGameServerWithGroup({game.Players.pro_developer213})

Source: https://devforum.roblox.com/t/how-does-camping-create-new-servers/397228/6

But i dont know how it work ;-;

Please Help If You Can!

Thank's for Reading!