I have a zone 6 8x10 and I am a bare essentials guy (who started shooting 8x10 in the 1970s)
Tripod. In the studio I use a very large Bogen with geared column but going out doors I use a much smaller Gitzo but still a heavy duty Bogen head.
Lens. Start with one and get used to it. Get another when you get frustrated with the first one.
Shutter release cable.
Loupe. I like 4x the best.
Dark cloth. Large.
Film in holders..... in package that keeps them clean.
Lens shade maybe but you can always use the dark slide to shade the lens.
Hat... like a baseball cap with a brim. The dark cloth messes up your hair anyway.
If you find yourself stretching out the bellow you will need some thing to sit on the camera bed under the bellows to prop them up. I use an empty duct tape roll.
A copy of " Using The View Camera " by Steve Simmons.
And a jogging stroller !
The most important equipment is a good back and good knees. Stay in shape. But routinely carrying 8x10 gear will accomplish that!
I own a lightweight Wehman but with my tripod and lenses, film holders, etc. it all gets too heavy for me so I carry the Ries J100 and pull the camera kit behind me in a wheeled cordura tool bag. I just bought a Gordy's strap for the Ries so I'll soon see how that works.
Some people use a baby stroller to wheel around their 8x10 cameras.
Yeah, I would probably be better off always carrying around my Tachihara 4x5 which I use for color film but I love the big 8x10 and it keeps me going so I'll use it as long as I can. :)
No kit is ever complete. Start with the bare essentials and add to it as the need arises.
You need a camera and a lens, something to keep the camera from moving (usually a tripod), something to trigger the lens (usually cable release), and focussing aids (dark cloth and loupe -- any cloth, sweathshirt, towel, etc. will work, and you can use any prime 50mm lens reversed as a loupe). Something to measure the light, film holder, you've got to get the film into the holder in the dark (changing bag, tent, or just a perfectly dark room) and someplace to put the film after you've exposed it (empty film boxes work well).
That will get you started, and your own experience will point you in the next direction.
Which brings up another important point: Your own ability to use the camera, especially mastering tilts and swings in the one shot. I'm still a long way from getting this down-pat.
When You have gathered the obvious (camera, lens, film, tripod, meter, bag etc) remember to bring notebook and pencil. Whenever you're missing something be sure to make a note of it for when You get home. Over the years Your kit will be complete and Your back will be strong.