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Well let me add. For losing fat, you need to eat at a deficit, but for gaining muscle, you need to eat at a surplus.you can do both at the same time contrary to popular belief. But your body doesn't really need that much extra calorie to build muscle. It is about 100 calories at most. For gaining muscle and losing fat, you really just need to eat at your maintenance or maybe 100 calorie above your maintenance and make sure you are taking in enough protein. Of course you need to lift very heavy in the gym (go to failure in every set), then you will definitely see muscle gain and fat loss. It will be slower than if you are at a 500 calorie surplus, but when you gain muscle fast, you might gain a bit of fat nothing to worry about though. You need to also get into a routine I can't stress this enough! be consistent! if you need help getting a routine check http://aestheticreview.com helped improve my gains 10 fold!
Hopefully this helps!