Fly Fishing Books/video recommendations?

[logs22]

I will be heading to Helena Mt. for Easter weekend and am hoping to extend my trip for a day to do some trout fishing on the Missouri River. I have never fly fished before and was hoping to give it a try out there. I will almost certainly hire a guide but I would like to pick up some gear before I go and try to at least pick up the basics. I figure between now and then I can squeeze in a few trips to the south branch to get some practice. Can anyone recommend a good book or video (or both) that covers the basics of fly fishing (including reasonably priced suggestions for entry level gear)? Thanks!