The search engine on this site is going to become your best friend.
Also, a trip to a local book store and look for Sausage making books, there are plenty of them out in marketplace.
The question you ask is way to broad for specific answer., so have fun sausage making and always remember, to right the recipe down in a note book, because when you get it right, you do not want to stand there scratching you head wondering what you did to make it so good.
For making sausage, you will need a work area, a grinder, some stuffing tubes to fit the grinder or a separate sausage stuffer. Then you will need casings, unless all plan on doing is making patties, which most beginners make Then there are the spice, do not use dollar store spices, find a Bulk barn or source where you can get real fresh spices. And a source of meat, be you a hunter nor not, some place to source good meats, cheap.
A meat tub comes in handy also. But a good rule of thumb is, always have an assistant to help.