Before you can edit your movie, you must have something to edit. This means importing whatever video and audio you want to include in your finished movie.
For most movies, your main source material will be your original video tape(s). You'll use Windows Movie Maker to record the tape as you play it back on your VCR or camcorder. You can import material from more than one videotape, in case you want to edit together several shorter tapes into a longer movie.