My advice would be to just start with one and see how it feels and flows as you write it. You'll find, as most of us do, that the story will go...
Just a thought, but you're worried about readers mistaking it for Earth, but this could actually add a nice element of growing knowledge as they...
I think location is one part, but you got to think of a situation as well. If you MC is withdrawn, drinking ad avoiding others, being open to new...
Separate names with a comma.