I want to create an escape the building type game

I already have the basic outline of the building but I’m finding it hard to grasp the more technical aspects of map building. i want to make a “sewer system” that transports you to the next building (used teleporters for this) and after 3 or 4 buildings of increasing size then at the end i want to make a door that when all players walk through the end door. Thanks for the help!

But what do you need help with? teleporters?