What Supplements for a teenager to take to burn 40 lbs in the gym.?

I workout 3x a week normal. I have my regimen of Biceps-Back One day, Triceps-Chest another, and Cardio (Which im not to religious about) I am on Creatine and Protein Shakes and Got pretty good tone in my arms. But one key concern is should i burn fat before i store muscle m and if so what supplement/supplements should i buy.