The only two factors that affect file size are duration, and bitrate. If you can't make it shorter, you have to reduce the bitrate.
how do I reduce the bitrate?
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That is something one should know or be able to figure out before one uses professional software.
It's like a driver asking as he approaches a stop sign "Which one is the brake pedal".
If you have to ask the question, you're not ready to drive the car (or in this case, use the software).
As I would recommend driver's ed for the one situation, I also recommend a formal education in video before one use Premiere Pro. For the casual user who doesn't wish to go that route, I recommend using consumer software.
Thanks, I'll look into bit-rate. I dont really have a choice about software and equipment. I work with what I have, some tutorials on-line with lynda.com but never mentioning bitrate.