Hate to go all grandpa on you, but IMO you should hold off a bit longer on AAS. I know gh15 says the pro's start way early but at 19 you still have crazy high test and gh in your system to work with naturally. I'd hold off another year or two.
If you are going to go for it, skip the orals. Go with a test base at 500mg/week and add in 250-300mg/week in deca, NPP or primabolan. If you don't see results from that, either your gear is fake or you have poop for genetics. You should put on 15-20 lbs of solid weight over a 16 week cycle. If you add orals, maybe 25-30 lbs but it's going to be water weight so don't bother unless you are low singles in bodyfat.
If you want to be huge, stay lean ALWAYS.