I intend to invest energies and time into the stock market. I am no expert by any means, but I have read so much on the subject.
The best website is probably:
http://www.stockphoto.net/. The best book has been already suggested. Those will give you all the info you are looking for.
Guys just a comment: Please don't sell yourself short and don't ruin the photographic market: do avoid micropayment stock agencies that sell your work for fees like $1 or $5.
Here is an interesting presentation on the topic:
http://www.tssphoto.com/photovalue/
Ciao!
Antonio