short answer--eat. eat a lot in a balanced nutrition program, 3,000 calories a day of healthy food should do it. It's actually a crapload of food and you might have to almost force yourself to eat at times to get the amount of nutrition you need, but until you get ahead of what your body is burning, then there is nothing left to build the muscle with. Anyone can eat a lot of unhealthy calories, but the lean meats and low glycemic carbs are what you're after, plus don't forget the oils. as was already mentioned bodybuilding.com does have a lot of good info.
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"Religion is the one area of our discourse in which it is considered noble to pretend to be certain about things no human being could possibly be certain about"
--Sam Harris
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