I love to check out www.childrensministry.com and look at the articles, the podcasts and other features. Use them to encourage and inspire yourself.
But to start off, look at this blog entry for 68 reasons why working in Children's Ministry is worth it!
And, don't forget to attend church. Either stay for an extra service, come a little earlier to catch it, or visit www.cornerstoneweb.org to listen or watch online!