How do you change to four maps? like first your in a waiting room and suddenly a map regens? and how do you teleport to it? And when you tele that's just the time you will get a certain gun.
Weren't you already given the script for this? You either need to script the teleport or remove the floor of the lobby and have a sub-floor as a teleporter.
It's all done with scripting. You should be able to find this information in the wiki.
If you post the thread once, don't keep making new threads, just bump the old one. That way you and other people can keep track of what help has already been given.