I was an assistant manager at a gym. Maybe I can help!
First of all, don't overdo it! That's the first thing that people do, thinking it'll help them, and it won't. In order to condition the muscles, you have to leave them enough time to assimilate what you've done, and to reach a "reset" point, of sorts. In other words, they have to reach statis, and be completely rested, so that you can exert them again. They'll build up better that way.
Muscle is built with protein. Eat meat and eggs. One trainer at our place would eat whole chickens for lunch. Drink protein shakes. That'll do it. Watch that you don't get stinky, because some of them will produce a smell when extruded from your body.
Don't do a lot of cardio.
That's some of things I recall. You should see some results with some good weight training, too.
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