Congratulations Macy. I'm sure you'll love 8x10.
As to whether or not you need a loupe on 8x10, that really depends on two things: how good is your eyesight, and what will you do with your negatives. If you have excellent eyesight and you are only planning to contact print, then you might get away without a loupe. I do not have excellent eyesight, and I've found repeatedly that I can focus the camera, then pull out a loupe and find out just how far out of focus I was. So for me, it's a loupe every time. (By the way, a 50mm lens from a 35mm camera makes an excellent loupe when you start out...if you have one then you don't need to buy a loupe until you're sure you actually need one. I personally use a linen tester as my loupe...cheap, easy to carry, and it works fine. YMMV.)
I'm a big fan of J and C in general (in my experience their customer service is so far over the top that it's astounding), and buy as much of my film from them as I possibly can. In 8x10 I shoot exclusively Efke 100 and J and C Pro 100. Both are soft emulsion films, and caution must be exercised when handling the film while it's wet.
If you don't mind long exposures, there are lots of good deals to be had on old barrel-mounted process lenses on eBay these days. I've picked up lenses of 240mm, 305mm, and 375mm, all of which will cover 8x10 with movements, and the total bill was well under $100. Since most of my exposures are in the 2-15 second range, using a Packard shutter (or even a lens cap) works fine for me. I've been very happy with the results I've gotten in process lenses from Eskafot, JML, and Nikkor.
For a dark cloth, I use two large t-shirts sewn together. A white one on the outside reflects light and keeps the temperature down a bit inside, and a black one on the inside stops reflections from showing up on the ground glass. There are lots of good products available, but I'm a big fan of cheap stuff that I can make by hand. My t-shirts have worked well for me for a while.
I own and use the Berlebach 4032. I simply could not be happier. Sturdy as can be with my Calumet C1 fully extended, with a heavy process lens at one end and a heavy wooden film holder at the other end...I don't think I could move the camera without actually moving the tripod itself. It's served me well, and I'll never buy anything other than another Berlebach in the future. (yes, it's bulky and heavier than the latest high-tech tripods, but it does its job and does it well...for a very reasonable price. I love things that just work.
For cable releases, don't skimp. Buy at least 2, and make them good ones. (This is, of course, if you're using lenses in shutters.) Compared to everything else involved in 8x10, even expensive cable releases are pretty cheap. And having a backup with cost you virtually no room and no weight...and you'll be happy that you have it if you ever lose or damage one. Bad luck happens to all of us from time to time.
Best of luck with the Ebony. I'm sure that you'll fall in love the first time you look at the ground glass. 8x10 is a whole new world!
Be well.
Dave