Making a trailer is, IMO, harder than making the actual movie. You have to show just enough to make the audience want to pay money and take time out of their lives to see it... at the same time you cant give away too much info or there will be no point to go see the movie.
<simon cowell> That trailer was awful. It made me want to get a gun and shoot myself and family in the head. It made no sense whatsoever. Please, please take you mac and burn it. </simon cowell>
Okay, really: I have know idea what the movie is about besides some vague reference to drugs and some insane guy and audio that is clipping. make it longer, take your time editing the trailer until YOU feel motivated to plan the next few weeks of your lives around seeing that movie. Add a soundtrack, title card at the beginning (something like " some addictions are worse than others, etc.." a teaser of some sort) and a title card at then end displaying the name of the movie. Finally, perhaps a voiceover would be good, of you have something important to say. Also, form a stylistic standpoint, I would make the movie B&W, high contrast and add some grain. It will look much better than DV, which is just ugly, and it will distract a bit from the clipping audio. Also, fire up Garageband 3 and really take your time doing some foley work. Nothing says ameture like bad sound.
Or you could just add some explosions, a rock band, and some women in bikinis.