I use a 80 year old Keystone hand grinder. It isn't very large, but it'll grind up a pile of meat quicker than you'd think.
I just made 25lbs of breakfast sausage, and 10lbs of ground venison the other day.
Did it all in about an hour. (once it was boned and cut into strips of course).
Its hard to tell someone else how to eat their food. You really just need to experiement.
I make alot of meat loafs, hamburger helper products, chilli, spaghetti, etc.
For this I just grind venison as it is.
If Im grilling deer burgers for...burgers, I add a little (10% or so) of some sort of fat, to help keep them from crumbling so much. Might be bacon, or trimings.