definatly protien, buy yourself a big bucket of whey protien at like costco (20 dollars for 6 pounds

) if you want to gain muscle then you should use a whey protien suppliment unless you are one of those people who eat 5-6 times a day and consume massive amounts of protien.
mreik was right to say not to do more then 15 reps, up to 6 reps is for strength, 6-12 reps is to grow mass, and higher then 12 reps is for muscular endurance, or so ive heard.
umm what else, make sure to get a whole body workout especialy if you are going to play football, try each muscle group once or twice a week depending on how hard you work out, running is good conditioning for football, uphills, dont run on days you work out legs because it is counter productive.
correct me if i'm wrong, because that would help me too
need any other advice my AIM name is cschuh17

, not really an expert on football, i know some stuff about body building, and a bunch about tae kwon do conditioning if anyone has a question.