Eating a ton, atleast your body weight in grams of protein. If you weigh 140 then eat ATLEAST 140 grams of protein. Lots of carbs, calories and even fats. Dont worry about eating clean. Just EAT, and meet that protein requirement everyday. Get used to it, cuz eating is essential to make steady gains. This is assuming you are already training hard and giving it your all in the gym. Eating is still the hardest part for me. I can lift for hours nonstop at full intensity. You will make gains in the beginning regardless since the body will respond with growth in new trainers, but that only lasts so long.