Don't sweat whats 'best' right now. Concentrate on eating real whole foods that satisfy you and keep you from eating vegetable oils, sugar, bread, pasta, soda, anything processed.... like the book says. Eat whatever amount is takes to keep your diet clean of these poisons. You can worry about the grass-fed meats, organic items, adjusting macro ratios, counting calories for weight loss, intermittant fasting,etc, etc... a little later as well.
Here's much of what I eat:
Beef - mostly hamburger and some steak
Eggs - I love eggs - hardboiled make good snacks when you need to
Fish - I try for twice a week
Colored bell peppers
Lettuce - salad was a staple lunch for a long time
Potatoes - baked or sliced and baked in the oven seasoned
Sweet potatoes - same as potatoes
Kerrygold butter - in cooking
Coconut oil - in cooking
Some sour cream
Some low carb ketchup
Salt & pepper
Go nuts with this list and items similar for two weeks. Then plan a night out with the wife at your favorite restaurant. It will be a treat, but learn to order decent primal stuff off a menu. Steak or fish, potato, butter, sour cream, vegetables. Skip the bread, pasta, salad dressings, etc. Order cheesecake or similar if you've been 90% plus primal over time.
Things I ate early on that that helped me stay sane - I weaned myself off of as I got cleaner:
All processed creamers in my coffee
The best thing you can do is adjust your attitude that health, healthy weight, and high energy is attainable if you change your attitude and eat only real whole foods. Avoid posts here that concentrate on all the negative aspects of health and life - people will try to drag you down. Do whatever it takes to attain your goals. Ask questions here and listen only to the positive people who have been successful - not the people who are always discussing only what doesn't work! They are are here looking to find others like them and rationalize their lives away in misery.
Attaining health and happiness is a two step process just like everything else in life:
1. Decide what it is you want to do.
2. Figure out how to get it fucking done.
Now... read my signature, grab the wife and go to the grocery store.
P.S. Next is exercise....