Search the web for artists you admire. Get their advice on working methods and links, not just technique.
Follow sites that keep you updated on changes in the industry.
Go to a local bookstore. Browse the featured books that interest you, and write down the names of the companies which publish material similar to your own.
There are plenty of books and sites I could recommend. For starters, try the ones below.
|Children's Writer's and Illustrator's Market|
|Writing with Pictures, by Uri Schulevitz|
The Purple Crayon by Harold Underdown
The Horn Book