Without a testosterone base it would change your life in a very bad way.
I think you are smart in doing the diet change before anything else.
Set yourself with realistic goals. If your goals are to be lean and fit and just some better calves you dont need steroids. If your goal is to develop your muscles beyond being lean and fit you may start to think about juice, but only after educating yourself on all aspects of the required drugs. Of course, its smart to do the diet change first, if you set yourself to reach 200lbs you need to eat like a 200lbs person would.