How does game:SavePlace and game:CreatePlace() work?

I want to save my place or create a place within my game how do i do that?

CreatePlace and SavePlace both require beta access. If you do somehow have beta access, you can use game:CreatePlace("PlaceName",463128561) (where the 463128561 is the ID for the template you're using, OR if the template doesn't exist, sets the place's ID to 463128561). As for SavePlace, I uh, don't know.

Just use wiki. There is everything you would need to know about CreatePlace and SavePlace:

http://wiki.roblox.com/index.php?title=CreatePlace_and_SavePlace