So happy you are here!
Good questions. Here is my opinion on them:
1. Buy any type of meat you can eat a lot of. Don't go after particularly fatty cuts, but don't be scared to eat some fat. Beef and lamb are better than chicken and turkey. Grass fed is better than conventional store meat.
2. Keep your carbs low and the rest will fall into place without much thought. All you really need to count is carbs, especially at first. Try to get them all from vegetables and very few from rice, potatoes, corn, or wheat. Later you can tweak that to see what you can tolerate. But, yes, 100g fat and 100g protein sound about right.
Also, no vegetable oil! no snacking! Try coconut oil, a couple spoons a day does you good.
Read Mark's books and the PB101 articles on here. They really do contain all you need to make this a success.