Ive been doing my own for manyyears as well as doing others and formerly a butcher. Its really not that hard or expensive to get started. If youre on a tight budget hit some flea markets and such, pick up a good meat grinder (hand crank will do you just fine) also might want some stuffing tubes as well, pick up a good bone saw. I recomend getting a new one. Check with your local butchers to see what they recomend for casings, seasons, cure, mixture amounts, etc. Then you need to figure out what you want to make. Most of your venison sausages are mixed with pork. I like to mix 50/50. Get yourself some good pork but roasts. Trim off the fat. From here the rest is up to you or what ever you find online or in game processing books. Have fun with it and do not be afraid to experiment.