You can put on some size, what juice does,well the best thing it does in my opinion is it makes your muscles repair quicker so you can do much more volume and regularity in your training. But you can put on some decent size with a sensible training programme and diet. The main thing to do is do your research and ask knowledgeable people in the gym for help with your form on exercises.Personally I would stay away from juice until you have at least have several years regular training under your belt.
The only supplements I would consider useful are protein ,but again use protein as a supplement, meals are more important ,protein shakes are useful though to get a certain amount of protein a day and are also convenient, but the base should be food. Steak and fish are my staples. The other supplement is creatine. It won't work miracles, but in my experience I added a few extra reps and it gave my muscles a fuller look which was nice. Creatine is really cheap as well, so something to add in I think.