I am weighting around 48kg and height 165-167cm..

Currently eating Quaker Instant Oat, 2 banana, HL milk and 2 half boiled eggs for my breakfast..

I read a lot of post telling that for skinny guy to bulk up, he have to eat around 6 meal per day.
As I couldn't afford more with my salary, should I just take mass gainer or whey protein?

I am trying to increase my weight to 55-60kg to reach normal bmi.

I do not want fat to accumulate at stomach, I wish to have 4 packs etc..

Please give me some advice