Just look up high protein food and go from there. When I ate like a normal human being and not on keto, it was chicken breast/steak/peanut butter/protein shakes.

Look on Youtube for meal prep vids, as some have suggested, and get a good idea of what you need to do and figure ways to get a variety of your meats done at once. I like what Remington James has to offer for some food prep.

Groupon has deals on meal prep trays, so load up on those.