You can get the guide from Barnes and Noble in the photography section or from Amazon.com. It's about 500 pages and is updated annually.

A website is a major advantage in selling stock photos, because it's easier for the editors to access, and you don't have the cost associated with sending slides through the mail for prospecting purposes. You just send a letter to an editor, and ask them to look at your website.

Also, put together a stock list to go with your letter.

--Jeff