was in your shoes few mths ago.
bought some mass gainer. but as what other bros advised, do concentrate more on real foods.

example: peanut butter with bread, almonds (i like those coated in honey) etc etc.

i've no idea. but i just chugged on it anyway (Musclemeds Carnivor Mass), split the serving to half morning, half noon.
In concentrating more on real food, in the first week u might struggle to eat more, cos not used to it.
but after that, u will naturally b hungry, then start searching for food.