USDA publications
How To Direct Market Farm Products on the Internet. by Jennifer-Claire V. Klotz, Agricultural Marketing Service, USDA. An indepth 50-page PDF file that covers all facets of setting up a web page to sell agricultural products, primarily form family farms. December 2002.

Northwest University publications
Internet Marketing for Farmers. by Sylvia Kantor, WSU Cooperative Extension, King County. 1998.