I read inGame that people recommend, but it's not it! I tried it and it doesn't stop the Player from Spawning... I wanna know how to stop the Players Spawning!
You should try to search Roblox Wiki for a bit before submitting a question... Anyway, you must set CharacterAutoLoads property to false.
game.Players.CharacterAutoLoads = false
You must then manually load each character with LoadCharacter