There is no point in taking steroids if your training and diet aren't spot on. I've been lifting for just over 2 years and gone from 13 stone to 15 stone naturally and I'm nearly 40. If you're a youngster you'll gain even more easily.
However, if you are insistent on using gear you're better off going for prohormones than steroids. They are hormones that basically do the same as steroids but are legal to supply in the uk and you'll know what you're getting. Been tempted but never used them as still making gains naturally myself. I have read up on them a lot though. Do your research around weaker first cycle ones like p-mag but make sure you have a proper PCT and cycle support in place as they have the potential to mess up your endocrine system for good the same as steroids. Good luck whatever you decide.