As someone will soon mention your test levels will still be very high and with a good diet and training hard you will see gains just as good. the fact that you have to ask so many questions shows your not ready, most ppl would advise not to start until your 25 and up and by then you should have a solid diet and done a load of research, it may seem like a good idea now because i know all you want to do is get big and ripped fast but this is not the way. hit up the diet forum and they will dort you out. Good luck Bro.