The goal of wls surgery is to use the stores of fat in your body, so you should not be needing that much protein in the beginning. You will feed off the stores of fat in your body.
I don't know how much a 'normal' meal will be to you, but remember that a wls size normal should be a lot smaller than a regular person's normal. I still, after two years, only eat 1/2 - 3/4 cup per 3 meals, plus a couple of smaller snacks per day.
A lot of people find that denser proteins - lean meat, tofu, beans, etc. keep them fuller longer and if you eat a lot of 'slider' foods - ie yoghurt, etc. you will be hungrier sooner. It doesn't mean these can't be good foods, just be aware that you could be hungrier sooner than expected if you are eating a lot of them.
Don't be too quick on trying to get huge meals in as your weight loss may be slower because you aren't drawing from your fat reserves. Also, why push how much you can ingest - you may end up eating huge amounts when not necessary to satisfy your actual hunger rather than head hunger.
Drink lots of water between meals to keep yourself hydrated and keep the proteins flushed from your kidneys; this will help to ensure you don't get kidney stones.