What would be the best limit to start at?

[PoorLawyer]

I think the answer is really whatever you are comfortable with. And by comfortable, I mean comfortable losing while you practice up.

Given that you have a pretty good roll and may know some applicable basic poker theory, I would start at at least 1/2, otherwise you are probably going to learn some bad habits if you intend to move up (though maybe .5/1 on stars, though I havent played it in years). Once you get out of playing for change there is some semblance of a game that doesn't always have 6+ players to 4th every hand. If you have the time, maybe you want to read up before playing at all.