No flame intented bro...but in terms of training experience...two months is nothing. I would suggest you train naturally for about 2 years and really get strict with your diet. At your age you can expect to put on 15lbs of keepable muscle per year without even touching the juice. If you need input or advice re:diet and training you've definately come to the right place. BTW...how much is a stone in terms of lbs or kgs? I've heard the term many times from Dorian and strength athletes such as Gary Taylor and Jamie Reeves.
Pete