Eat 5 times a day, eat more calories than you burn. Even eat when you don't want to. Wake up eat. 3 hours later. Eat. 3 hours later. Eat. 3 hours later. Eat. 3 hours later. Eat. Sleep and repeat. Measure what you are eating, keep a log of calories in and out and you will get results.

Carbs + protein in every meal especially when you are training.