Games : Trying to teleport members in a certain team in minecraft

I am creating a server in Minecraft and I would like to make it when a player gets to a certain area it teleports the members of a certain team to a different location.

I would also like to know how to separate different areas for commands in different worlds so say you use a command block in one world it will not effect anyone in the other worlds.

Also how if possible to set it so you can have different games in the same world but none of the commands will work from one game to the other.