when i was in high school and wanted to bulk / build for rugby my school gym teacher (who was a former under 21 Mr New Zealand) gave me the follwing advice.
Eat 8 times a day, Sleep 9 hours at least, Gym 3-4 times a week low reps heavy weight.
Eat : Red Meat - lean mince, diced beef and steak. lots of it
White meat - chicken and turkey. lots of it
Wholegrains - rice and pasta - lots of it too.
Dairy - cheese, eggs get it down you.
Peanut butter - needs no reason, its the best way to gain your daily fats.
Drink: - Grape juice - great natural sugar pre workout pick me up
Milk - Semi skimmed and at least 4 pints per day.
Leave the supplements alone until you have built a solid workout regime and put on a bit of muscle from your upgraded diet. Its far cheaper to buy a months worth of mass building food from the supermarket than it is to buy an overhyped powder or test booster that isnt going to do anything much for you. Once you have made the proper transition from casual gym attendee to dedicated weightlifter with the diet sorted you can go ahead and get some whey and creatine if you need it.
I wouldnt **** around with any hormone altering supps until you are well past 25. You could end up with premature hairloss and shrunk balls if you aint careful.