While I was never a pro bodybuilder by any means, I was very successful using a 40:40:20 diet (40% Carbs, 40% Protein, 20% fat) while lifting weights. Be sure that your diet is clean (no junk food), and drink plenty of water. The only supps I used were whey protein, a daily mulitivitamin, and fish oil pills. The biggest advice I can give is to take a protein shake as soon as possible after a workout. Be sure your shake has a fast absorbing carb along with whey protein powder. Popular ones are grape juice or gatorade.

What are your plans cutting or bulking?