I am starting a direct sales business. I want to send a letter to everyone I know introducing what I am selling. How do I do that?

It sounds like you are wanting to put out a letter of introduction. The following sites are excellent for providing information to write letters of introduction.

Idea Cafe Small Business Archive: "Company introduction letter" (http://www.businessownersideacafe.com/cyberschmooz/marketingmix/3612.html)

Introduction letter - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Introduction_letter)

cover letters - sales introduction letters and inventions ideas submissions (http://www.businessballs.com/introletters.htm)

Introduction Letter... The key business letter for getting your foot in the door (http://www.writinghelp-central.com/introduction-letter.html)

Welcome to ASP web site - introduction letter (http://www.asprotection.com.au/introduction.htm)