As for diet, they need lots of hay. It will help for when they ingest the wool. The pellets you feed should be at least 16%. If you are breeding, you might want to go a bit higher. Not all pellets will work for all rabbits, so you might need to try a few before you find the right one. They can have veggies if you want to give them. They don't need more food that other rabbits of a similar size. My 10 pound giant angora gets 1/2 cup of pellets along with hay and veggies a day and she maintains a good weight.
Papaya a a treatment of wood block is false. The enzymes need a ridiculously high temperature to work, and that is if they survive the stomach acid. I am not sure about pineapple, but I don't think it is that effective either. Hay is the best thing along with grooming. My angora doesn't get papaya tabs, and she doesn't have issues with lots of wool in her poop. There does seem to be a ton in the carpet though. A well groomed coat will mean there is less loose wool, so less for them to ingest. Exercise also helps keep the gut moving and move any ingested wool out.
A small shop vac will work as a blower. There are ones that have a blower port. I would not use the vac for anything else unless you clean it after. In the full coat, about 6-8 weeks after you sheer, you should be blowing the coat every day. Depending on your rabbit, they will need to be sheered every 3-4 months if you are using the wool. A hair dryer can be used to fluff up the coat, but isn't effective for day to day grooming.
You will also need a good set of electric clippers. Oster is a good brand. The most important thing is a blade that can do the job. I use and Oster size 10 blade. Some people might use a size 30, but it does cut quite close so you need to be careful. A decent set of clippers will cost about $150-200. You might be able to find a dog groomer who can help you. If the breeder you get your buns form lives near you, they might do it for you too. You can cut the wood with scissors, but it will be uneven and you can't cut the wool as close as with clippers.