Folders are great, since they are relatively light weight, and you still get a big juicy negative. I often use mine when I travel.
You can shoot a stop or two higher speed film compared with 35mm, and still end up with a 'smoother' look. Remember that your top shutter speed is limited compared to a DSLR, so for daylight work, you'll be wanting an ISO 100 or 400 film. For general use, an ISO 400 film, even downrated a bit, will probably be the most versatile. I'd pick one, and shoot a few rolls to get to know its characteristics.
Depends a lot on what subject matter you are shooting, but if you think of the old 'f8 and be there', I don't think you'll have too much trouble with DoF. Treat any lens DoF markings as conservative.
You don't need a dark room to process your own film, just a changing bag and daylight tank. You can them scan the negs, and print them on an inkjet. If you don't want to process the film yourself, you may want to shoot one of the C41 black and white films like Ilford XP2.
Have fun, the Fuji/Voigtlaender folders are nice cameras.