As Martin said, don't waste your money on the supplements that claim to work like steroids. Nothing works like steroids but steroids and IMO you don't want to be touching those until you have a good few years training under your belt, have managed to put on a 2-3 stone naturally, and have really thought about the potential side effects and consequences.

Everyone will do really well naturally if they make sure you get your Training, Diet and recuperation spot on. If you cut corners by taking gear early on you'll just loose it all when you come off it because you haven't got the bascs right.

Check out the sticky to help you work out your diet. Biceps like other small muscle groups(calves) tend to grow well when you are putting on weight, but unfortunately none of it is easy

Good luck.