These are some great sites that might help you and get your works read.

1. Spilling Ink (the website of a great writing advice book) : http://www.spillinginkthebook.com/the-book/
2. Stone Soup (a magazine that publishes work from kids ages 8-12): http://www.stonesoup.com
3. Writopia (a website for the writing camp/after school activity if you live in Manhattan, Brooklyn, Washington DC, Los Angeles, New Jersey and Chicago): http://www.writopialab.org
4. SCBWI (a website for anyone who wants to write child lit): http://www.scbwi.org