For now, I want to point you to The Complete Idiot's Guide to Publishing Children's Books, by Harold D. Underdown. This title is a must-read for aspiring children's writers, and an insightful refresher for published authors, too.
I invite you to stop by my page for beginning children's writers (if you haven't already). I do recommend another terrific title there. :)
I used to recommend several individual titles here, but the coding for the links recently became obsolete. I'm not sure when I'll have the time to update them.

