To keep it simple, you should eat, eat, eat, then when you get done eat agian. Try to fit in som eheavy lifting to. like a 5x5 routine. Make sure to get plenty of sleep also. Get a good whey protien shake (I like Optimum Nutrition 100%) Try and eat healthy foods and meats, but as long as you eat you will be ok for now. Just dont forget to eat. When you feel full that means you need to eat again.
Good luck bro.
Good luck bro.