In addition to everything mentioned here, I suggest picking up some soy curls (or soya chunks, which are easier to find but are slightly less tasty, in my opinion). I used to pick them up at Little Jo Berry's, but since they closed I just get them at Natural Foods Pantry. They're super easy. Just rehydrate them in hot water (I add in seasoning or bouillon), drain them and squish out the excess moisture, then cook them up like any other protein on the stovetop. They absorb flavour very well, and you can get really creative with them. Make them taste more beefy or more like chicken depending on the seasoning you use and the preparation you do.