Hey Mate,

I'm not a personal trainer but if you want to take on my general advice, i'd suggest trying to have 5-6 smaller meals spaced out over the day.

Try to have Carbs, Protein and Good fats amongst these meals.

I'd suggest getting into the gym and start trying to get into a routine of putting your muscles under stress. Then eventually try to lift heavier to build muscle mass.

Love to hear how you go mate !