www.amazon.com
Search for "stock photography". You should find quite a selection.
Dan Heller's website is okay... He offers his views on the subject, some good ideas and a business model that works for him. There are others.
I tend to look toward the people who are acknowledged as among the top stock photographers in the world... The photogs who make 6 and 7 figure incomes off stock sales. Most actually offer stock as a sideline and a secondary revenue stream from work they are already doing.
Check out Bill Bachmann's website. He's among the top five or six stock photographers in the world, but he as always promoted himself as an "assignment, travel & liftestyle" photographer, not as a "stock photographer". Yet he employs a couple people full time just editing, keywording, uploading and selling/fulfilling his stock through six different websites. If you ever have a chance, go to one of his seminars. Very eye-opening.