I'll lay off the strategy for 5nl and 10nl, except to say that aggression isn't always the best way to go. Like Robb said, it's all about value-towning really bad players who don't understand hand value.

There have been a bunch of guides written about building up a roll in the early stages, and I think the accepted means is to start at PS. There's almost no rake in the micros because they don't rake a pot until it reaches $1. When you reach $500-$600 you can take advantage of the deposit bonus AND rakeback at FT. That way you are playing limits that will allow you to clear the full bonus in time.