Like specifically every single thing needs to be done, or just more specific overall? I'll just give both.
Animals still drop items like normal, they just drop more and different things, for example a Pig:
1 Pig Hide
2-3 Raw Pork
1-2 Raw Fat
2 Meaty Bone
1 Raw Organs
Somethings can be eaten, others used as furnace fuel, some as fertilizer like bone meal (such as feces), and almost everything can be crafted into different things. There's also a knife that is required for some recipes that should have 1 durability lost every time used, and a needle has similar use. Some recipes create multiple outputs (Bone -> 2 Bone Shards and 1 Raw Marrow). And sheep can be milked for Sheep Milk, and animals drop things like chickens laying eggs (feces mainly).
I think that covers all the grounds this mod takes, incase it was something you didn't know if you could do. But if you are just looking for everything that needs to be done to do it, I can put you in the PM that me, the old coder, and the other texturer use. There's also a Dropbox that contains all the textures and explains almost everything in the mod, I'll probably revise it today to make it 100%. So hopefully that answered the question in some way, cheers.