Heavier guys taking suplements

Hello Marc! I wanted to start out by saying that I am a heavier male. Im 20 years old, 5'9 260 pounds at 38 percent body fat. Im thinking of buying a test booster, BCAA, Bio Gro, as well as a protein powder. I want to buy these and make a big push to get down to a lower body fat percentage. I want to know if buying those things will be a waste of money. And if I shouldn't buy those things until I get to a lower body fat percentage.  

Thank you!