Have you bought a seasoning mix yet? I recommend getting a kit that includes your spice mix, cure, casings everything you need.
I have used LEM and think theirs are over-seasoned, masking the deer. I prefer Butcher and Packer. http://www.butcher-packer.com/index.php?main_page=product_info&cPath=210_214&products_id=394 That link is for their venison summer sausage kit. You can get a kit for 10 or 25 pounds of finished sausage. Follow the instructions, you will need to add ground pork. Using pork butt give you a good fat/meat ratio. Personally I tend to ignore the instructions and go more 70/30 venison/Pork Butt. You will want to avoid excess moisture while smoking, It would be easiest if you give them an hour of gentle smoke then finshed them in a 200 degree oven. Plunge them in a sink full of ice after they reach 150 IT, leave them in the ice water until they are reasonably cool to the touch.