Been there and done them and would again. Best advice I can give is you must use them ONLY as an aid with your hard training and good dieting NOT as an instead of. Go and see your doctor and get checked out before using them too, they will try and talk you out of it but if you are determined they cant refuse to give you a check over and advise you if it will effect your health. NEVER buy off just anyone, only buy from trusted sources and do as much revision into the steroids you want as you can.
Sus (Sustanon 250) and Deca is a very common starting combination for new users and can have quite good results. PCT is essential with taking all steroids too, some dont bother and some do. Personally I always used HCG 2 weeks before ending cycle and continued for 2 weeks after cycle.
Research research research before you start using..... there is an abundance of information around online now, unlike when I started using them some years back. Go on bodybuilding forums and websites and read up on them. Theres websites for nothing but steroid info like
http://www.steroid.com/ among others.