i agree with CL, i understand where your coming from, i'm 18 and having been researching for a while, but i've promised myself not to start till i'm atleast 23. You should read this thread
http://forums.steroid.com/showthread.php?t=15197
trust me, you can get big without them if you try, i used to be 4-11 250lbs in 6th grade and almost died from an enlarged heart. now im 5-7, 190-195 lbs at 9-10% bf. you can do alot with diet and cardio if you bust ur a**. Just imagine how big you'll be if you wait a couple years and then start when your done growing and have ur diet and training in check, plus by then if you keep researching you'll know enough to make good decisions on cycles and an income to get what you need. its win win.