Welcome to LF, Alex. Sounds like you have a nice basic set-up to get started.
Except for wide-angle lenses in deeply recessed boards, where you might want to leave a cable attached, I think you'll find that one good cable release of moderate length will be fine.
Getting your mother-in-law involved in making you a dark cloth might be a good political move. You'll have to judge that one on your own.
My suggestion would be black on the inside, and white on the outside. Make sure the fabric is of a tight weave, however. The darker it is under the cloth, the better. A simple rectangle shape is fine, or you could get fancy. I'd keep it simple to start, though. With use, you'll discover features you'd like to add over time. There have been a few discussions on this topic that you can probably find with the search feature.
If you can get 4x5 Polaroids where you are located, you may find the instant feedback they provide to be helpful. You can also use the 4x5 Polaroid holder (545i) with Fuji Quickloads or Kodak Readyloads. Eventually, however, you'll want to load your favorite sheet film in regular holders.
An inexpensive light meter will get you started, but I'd suggest giving some thought to a more feature-rich meter in the near future. In that regard, my suggestion would be to consider it an "investment" of importance on par with a lens purchase. Otherwise, you may find that you'll end up buying several meters over a period of time as you discover the need for additional features.
Anyway, have fun on your adventure.