When we started into it we had no clue what was even edible and went with simple. Literally eggs and bacon in the morning, then steak and eggs. Definitely getting from local farmers is the best if you have good options. Simply knowing where your food comes from makes a difference.
I get the going humane thing, corporate farms that have been grossly subsidized are awful. And it’s not even merely in how the animals are treated. Unhealthy, pumped full of antibiotic, locked in a metal box, fattened with corn and grain cows are literally bad quality meat on top of being inhumane (still better than most other foods, but bad compared to well raised meat).
The healthiest meat is simply from the animals that had the healthiest lives. And you can’t know what you are getting unless you see it yourself. All the “ratings” and “certified blah” regulatory stamps are all pretty much worse than horseshit, unfortunately.
You are right that nutrition is running at a million miles an hour though. It’s been crazy seeing stuff we learned about 12-15 years ago that was crazy fringe now slowly becoming common knowledge.
I would definitely start with eggs. Both delicious and a good, simple way to get animal proteins in your diet. I’d bet you won’t regret it. My wife is big on fish too, but I’m more of a steak guy myself.