I have a kitchen aid as well and have been thinking about getting the grinding and stuffing attachment. I've made homemade sausage but just made patties so far. My dad has one of these:
He inherited it from his father along with the recipe. I got him to give me the recipe but I'm still tweeking the amounts of spices. The recipe he has measures them in "hands per inch of meat".
For 5 lbs of pork sausage:
5 tsp salt
1.25 tsp pepper
5 tsp brown sugar
1.25 tsp coriandar
0.25 tsp thyme
1/2 + 1/8 tsp allspice
0.25 tsp dried sage
1/2 + 1/8 tsp paprika
The last time I made some it came out very close to what he makes. My notes say up the spices a bit. Also, you need a good bit of fat in the pork. Since I can only ever find very lean ground pork around here I had the butcher grind up a couple pounds of beef fat for me and mixed it in.