Here Are Some Great Books:

Annual Artist's & Graphic Designer's Market By Writers Digest Books

The Big Book Of Cartooning By Bruce Blitz

Any One of the Great Cartooning books By Cartoonist Christopher Hart Published By the Watson Guptill Publishing

Art Marketing 101 A handbook for the fine artist By Constance Smith

The Artist Market Business Series From Northern Light Books; There Are A few Books In the Series So Check It Out

LEGAL GUIDE FOR THE VISUAL ARTIST By Tad Crawford

How to Survive & Prosper as an Artist By Caroll Michels

The Encylopedia Of Cartooning Techniques By Steve Whitaker

{How To Be A Successfull Cartoonist} & {Drawing & Selling Cartoons} Both By Randy Glasbergen

I hope these Hints & Links Help. Good Luck out there :)