Try to find somebody local who shoots large format and go out with them or get together somewhere. A few minutes of show and tell are worth a week of reading, though the books are a good idea. The whole process is fairly simple, like playing chess, or wheel throwing pottery - you can learn in a session or two and then spend the rest of your life getting good at it. You can develop 4x5 film in the canister you use for two rolls of 120 film. One sheet at a time is easiest- just put it in with the emulsion facing inward. Two sheets can be done by folding them over a bit and holding them in a "U" shape with an elastic band, again with the picture side inward. Place them in the canister with the open ends of the U shapes facing in opposite directions so they nest in the space. You might want to shoot paper negatives at first to get used to the process if you have a darkroom and do any printing. Paper is cheap, you can load the holders with a safelight on and you shoot, put the paper in the developer and see right away of you have any problems. I do it to test new or odd lenses I get- and then scan the negatives, invert the image and get a chance to look at the positive in minutes. Not as fast as a Polaroid, but cheaper. One warning: 4x5 film is not 4 inche4s by 5 inches, it's smaller by about an eight of an inch in each direction. Cut your paper accordingly or you will never fit it into the holder.
Above all, have fun!