Self Prescribed Diet Help

I was wanting to do a self prescribed diet, but everybody is so different on this forum some did not even have a diet. My bmi is only around 36, but I was wanting to do this to be safe during the surgery. I only eat 2 meals a day now being a college student/ worker I only eat around noon than eat around 7 or so. Never been a breakfast person, so i was thinking about doing protein shakes and one lean meal.

Can someone give me the details of the total carbs I should have a day, and calories?

Or give me a outline of what your diet looks like.

I'm going to go full liquid protein shakes two days before my surgery.

I started drinking a protein shake just now with Starbucks instant iced coffee mixed in and it tastes like a frap! Its soo good!