Welcome to AR.
If you are at 15% bodyfat, what you need is a good diet and lots of cardio (not steroids) to get lean. Steroids DO NOT burn off fat. The only thing that causes fat loss is burning off more calories than you eat.
Look in the drug profiles section (link in fine print below) for Clenbuterol. Now that burn off fat!
Stick around and keep reading posts on the board. Anytime a post looks interesting, read it; you'll pick up a lot of knowledge in no time.