Forgive me if this has been mentioned already, I didn't see it in this thread...
There's a VERY valuable resource out there that I believe every professional (or semi-professional) musician should have. It's a book by Jeri Goldstein called "How To Be Your Own Booking Agent". It's about $30.00US but a very worthwhile investment.
There's a wonderful chapter devoted to creating a promotional package, as well as PILES of useful information about all aspects of managing your music career.
I think it's extremely important to put your package together with the end users in mind, rather than simply creating something that looks good to you. You have a lot to gain from learning how professional agents, managers and promoters approach their work, and what guidelines would best suit your type of operation.
Here's the contact informtion in case you're interested:
Published and distributed by The New Music Times, Inc. P.O. Box 1105 Charlottesville, VA 22902 Phone 804-977-8979 Fax 804-977-6914 E-mail firstname.lastname@example.org Web www.nmtinc.com
best of luck,