If I were you, Michael, I'd wait another year MINIMUM! I don't want to sound like a hypocrite or an asshole, but Michael, I really doubt you know what you're in for.
A lot of guys your age think steroids are the "magic" compound that solves your problems of gaining those extra 5-10lb. of muscle. It's not. There's so much information you have to understand and research you have to do before you can even touch such things. At your age, unless you're one of those poor unfortunate souls, your test levels should be quite high and you should gain just as much muscle if not more with simple diet and training than you could get now with some Test.
If you're still considering taking them and nothing can change your mind, then at least stick around a while longer, read everything you can, and then you can make the decision to use them properly.