This may sound selfish, but I don't put proposal info on the website, because after all, only so many companies will dish out merchandise and/or cash every year and I want every penny of it  

  I worked almost 2 months (off & on) on my 17 page proposal.  I researched online and bought a few ebooks on the subject. 
Basically, you're trying to sell yourself as best you can.  I spell out what I'll be doing, where I'll be, and what I'm looking for from them in return.  That's also the reason I have a few shows in the schedule to give more exposure for the sponsors.  The more you can promote, the better chance you'll get on getting something.