At 17, with only two months training, you need to realize that it's just going to take time. Don't waste hundreds of dollars on supplements looking for the magic bullet. Nothing will take you there fast.
You're already at a good time hormonally (don't mess with PH or AS), so make sure you optimize your diet (get enough calories in the correct percentages; start a food log if you're serious) (this single concept is the downfall of many, many, people); stop drinking, don't smoke, take it easy on pot (assuming that you, like most teenagers, imbibe), sleep well (8+ hours a night); train right -- train all parts and don't overdo it 3-4 weight workouts, 45mins to 1 hr, each week.
If you can't eat right (including proper pre- and post-workout nutrition), sleep right, not drink, not smoke and train right, then you shouldn't even worry about supps. Adjusting the above until you have it perfect will give you far more gains than anything else.
If you can get those things right, first thing to add is a good multivitamin/multimineral, after that, I'd add fish oil (not flax) at a high enough dosage to get 3 - 5 grams omega-3s/day (don't use cod liver oil); after that, a high-quality protein (don't get $5 a bucket stuff) a good CFM whey (such as what proteinfactory.com sells (just don't get in the trap of taking in all your protein through shakes, you won't get enough calories and you'll miss out on some of the things that only "real" food can provide). At this point, I'd consider adding in chondroitin sulfate for long-term joint health; after that, glutamine, creatine, etc...