I'm going to have to watch the rest of this later (terrible satellite internet. bleh) but I wanted to mention that, when I used to mess around with Windows Movie Maker, I would get around the lack of audio tracks by rendering a version of the movie with as many audio fx I could fit in the first time around, and then open that movie up with Movie Maker. After that, I would have an extra audio track to work with because all the audio from the first render would become consolidated into a single track. Just be sure to save different versions of your project as you progress.

EDIT:
Watched and rated
There's a lot of room for improvement here. My issue with it is that you've, figuratively speaking, just shown me EVERYTHING that happens in the movie. Nothing is left to the imagination. You've got lengthy clips from every duel in the film. It plays more like a scene from Star Wars: A Musical Journey than it does a real trailer. Tighten things up a bit and I promise it will go a long way.