It's pretty much as @PrinceAlexus described. You just imagine your characters as every-day people, but as he said, you're also free to make them famous or poor. It's your preference. If you have time, read some of the old thread and you can get a feel for what we mean.
I think I have put a like on everyone that has put a CS here. Consider it pre-approval (kinda sounds like we're giving out loans). I don't think I missed anyone. When the time comes and you want to change/add something just let us know before we give the official word.