I took the first deer i ever shot to a processor and got totally ripped off. I've done my own ever since. Its become one of my favorite parts of the season. Theres no need to go invest a big wad of cash all at once, pick up pieces of equipment over time at garage sales, swap meets, flea markets... even dropping hints around xmas and birthday time can get you a good score.
Absolute must haves to get started, a big cutting surface, and a good sharp boning knife. I wrap my good cuts in plastic wrap and then freezer paper. I was given a food saver as a gift a couple years ago, but I still prefer my old plastic and paper. Grind meat and jerky cuts get stuffed into gallon size zip lock freezer bags. I can usually get approximately 5 lbs to a bag.
A good video or two are great resources as well. Even if you only need it to know where to find unwanted glands and to identify particular cuts.
Then you can start picking up what ever equipment suits you. I prefer dehydrator for making jerkey, some like to use the oven or a smoker. I did invest in a grinder (which im gonna need to get back from Adam) and a 15 lb sausage stuffer. I wouldn't mind a slicer, but a jerky board works fine for now. Adam did score a couple old refrigerators last year, and I gotta tell you, that is the shit! I was able to quarter and hang my doe this year and get it butchered when I had time. Next one is gonna hang a bit longer like jesses.
I'll probably try the corning as well
As far as jerky and sausage, my favorite resource is waltons inc. Everything you need, tools, equipment, seasonings, casings, ... you name it. One of the cheapest places I've found for quality high temperature cheese for sausage