Don't even bother looking at your BB/100 until at least 50,000 hands.
Just concentrate on your game and don't worry too much about how much you're winning or losing. As your game improves the winrate will take care of itself.
My winrate so far this year at Full Tilt 5/10 is 1.4bb/100 over 87,000 hands, but for the first 40,000 hands I was losing at 0.7bb/100. So you can see that it changes a lot very quickly.
Oh, and by the way, I grabbed that $50 bonus offer for Mansion and played a few thousand hands at the micros on ipoker. I'm shocked at how tight the games are at .10/.20 these days. I would really advise the new fixed limit players at the micros to internalize the bronze strategies as quickly as possible. Use the bronze charts and even raise your bluffing frequency against the nits.
Definitely get an understanding of three bronze articles. "Flop Textures", "Heads up on the flop" and "Odds and Outs".