A good clean diet will do wonders. Stay away from fast foods. Eat plenty of chicken and lean beef. Also, eat often. Get a good breakfast, mid morning snack, lunch, mid afternoon snack, right after you work out, and good dinner.
Don't want to eat too much just before you work out. An energy bar or a little caffeine might help. Post workout, I enjoy a protein shake (optimum nutrition). I buy my supplements online at Allstarhealth.com. Make sure you get a good 8 hours of sleep too.