Dani-
You can do even amounts of meat or more gator than the rest. If you want it to be a gator sausage I would go 50-60% gator, 25-35% pork, and the rest chicken dark meat untrimmed. If you wanted to get a little wild with it you can mix in some duck meat, liver, hearts etc. in a 5% or less mixture. Again you can adjust the %'s to your liking, but remember that fat is what binds the meats together so you will want to use fatty cuts. If you don't you will need to add some form of starch to the blend to help bind it together or just add some pork fat.
There's plenty of spicy sausage recipes out there and plenty of pre-blended mixes. You will want to use a natural casing and considering the part of the country you are in it might be harder to find. And you will want fresh natural casings. Let me do some research and see if I can find a source that is reasonable for you.
The grind size, the meat %'s, and casing all play a factor in the texture, bite, and mouth feel of a sausage. If you like a good crisp bite to where you can tell you are actually eating meat (small chunks) you will want to grind the meat 1/4" or larger. If you are eating it in the form of brats or using in chili and sphagetti I would grind half of the meat 1/4" and the other half 1/2". Then when you blend the spices in it will break down the meat a little. Also let the meat and spices set for 24-48 hours before stuffing into casings. Then you can cold smoke it and cook with whatever method you prefer or fully smoke it.
Maybe this will help some, if not keep the questions coming.