lfphoto.info is a great source for info about getting started in large format with lots of practical information and equipment reviews. Also check the _View Camera_ magazine website, which I think has an article about getting started in 4x5", and you might take a look at Steve Simmons' book, _Using the View Camera_ for some basic information in an easily understandable format.

Fish around on Kerry Thalmann's site, mentioned above, since he's written quite a bit on backpacking with a 4x5" camera, lightweight cameras, and lightweight lenses. There are some backpacking threads as well at the Q&A forum at lfphoto.info.