How to make a lobby?

I want to know how to make a lobby that Works like in Darkness and Murder Mystery, where everytime the NeXT round starts everyone get teleported to a map and one of them is chosed to be a killer or something like that.. Can someone help me with this? .-.

You can put spawns in the lobby, and whenever a new round starts, you can teleport all your players in an in pairs for loop, and "MoveTo ()".