Try eating several smaller meals throughout the day to start with, you can increase the size of the meals as your body adjusts, & I would shoot for 3500 - 4000 cals, 300 proteins, & 400 - 500 carbs (complex) per day.
Isnt that more for cutting? I already get like ~450g of protein and ~500g of carbs. I always eat wheat bread and brown rice.