Have a reasonable goal in mind. Your best results are achieved gradually over time, through working out hundreds of times. Using steroids, stimulants or other harmful substances in order to build muscle will cause damage to the body, and may even cause more serious consequences.
You should think about taking supplements if you are having a hard time building muscles. Creatine has been shown to help you add bulk. It's been an important supplement for a long time for weight training. If you are still a teenager and not done growing, then you need to avoid taking supplements.