Congrats on the deer. As far as next steps, it sounds like you should start chopping vegetables for a venison roast.
Besides the bucktail you can put the hide and tail to tons of uses. Spinning, and wings and tails on dry flies (using deer hair for flotation instead of dry fly hackle on patterns like the Haystack, Comparaduns, Sparkle Duns, X Caddis, Deer Hair Emergers and as a replacement for Elk Hair on Elk Hair Caddis. The gray deer hair with a black body 16-18, with an olive body 14-16, and gray body 14-16 cover a lot of caddis hatches in the East.
Here’s some stuff by Chris Helm, that might help:
Tips for selecting deer hair - Choosing the right hair will make your deer hair flies - Comparaduns, EHC´s, Muddlers, bass bugs - much easier to tie. - Global FlyFisher
Tips for selecting deer hair - Hide chart - Selecting hair from the right part of the hide - Global FlyFisher
As far as prepping the hide, I've heard guys use everything form borax, salt, using tanning stuff from feathercraft, etc.
But I've also heard guys like Chris Helm just use repeated rinsing in water with ivory soap to wash and degrease, let soak overnight rinse, tack to plywood sheet and let dry for a few days with fan blowing on it and whack it up with a carpet knife. Anyone on the board use this method?
Whatever method you use, be sure to scrape it thoroughly to get all the fat off before you do anything. Holler if you need help on preserving the hide for tying, I'm sure lot's of guys have done it, but I'm not one of them.
Congrats again, and good luck with hide you've got lot's of tying to do.