On one level, making movies sounds kind of easy. You shoot your video, capture it on your computer, edit it into a polished production, and then spit it out for your viewers to adore. Then you start thinking about details like formats and resolutions and codecs and frame rates and DV and MPEG-2 and authoring for DVD, and it's pretty easy to get sidetracked by the details.
The good news is, it really can be as easy as it sounds. The bad news is that you need to learn a bit about digital movie making before getting started. You don't need a semester course; reading the next few sections should make the rest of the book a lot easier to understand. I know this stuff seems basic, but the devil can be in the details.