I dabbled at home for many years before a became a licensed taxidermist. I use the same suppliers now that I did back then. McKenzie, Vandykes(now Mckenzie), Research Manikins, WASCO, Jim Alred, and there are many more out there. I mainly order from Mckenzie for there quick shipment. order on Mon before noon, I receive it Wed.
I used to use John Rinehart taxidermy, but that company has been bought out by McKenzie. Some of the Rinehart deer forms are still available at McKenzie and they have an option to purchase the forms with pre-set eyes. That makes it easier, but with a little practice, setting your own eyes can change the whole apperance of the animal.
My opinion is bigger animals are easier to work with. It seems easier to flesh the hide and get it ready to tan. The small animals have thin skin and are hard to get cleaned up without tearing the skin.