Though you're gaining some experience don't take too much from playmoney. Most people will call you down regardless of whether you're LAg or TAg and you won't really see the effect it can have. Freeroll MTT's are better once you get to the point where the people who really don't care have busted out, then you might see some decent play, but don't count on it.

Stars have 0.01/0.02 NL and similar limit so you should probably just stump up $50 and give it a try. You can always withdraw the 50 once you're up to 100/200.