How to use and create game universes?[Unsolved]

Hello, So I have a few different questions concerning game universes or just games with I interlocking places. I am completely new to this and couldn't find much on the subject within the roblox wiki. I am wondering how I can create a place that branches off of the hub or main place entirely from a script so I could say; open a place for a specific person and when they leave it closes.

I am also wondering how I can transfer variables between those places for example a leader board in the hub place that collects data from all the places.

Another question is, is it possible to say, have a database of pre made places and then alow a player to choose a place he/she wants to play in and have a server open with the correct map.

It's a lot of questions all at once but any insight you can give me would help dramatically. If something is unclear let me know and I'll try and explain better. Thanks, Lordrex12345

EDIT: At this point I've solved most of my questions concerning universes but I am still wondering how to use the correct lua syntax to create a template of a place you already have made.

Go to the Develop page, in "My creations" go to the games tab at the left, find which game you want as a hub, to add a place too it. Then click that gear thing at the right of the place you want, click configure, then you can change the name of that game universe or you don't have too, then click the places tab at the right, then you can see your start place that was set for it, the start place is the "hub" for the game, then you can add other places, that later you can make a teleport script to teleport the player to different "maps" that you say.

You can use the settings in your game-place to make relationships with other game-places owned by you. After you do that, use the the Teleport function in a gui or part. You can look up the teleport function on Google. It is late, I'll make a script tomorrow probably.