If you need help with motivation for your book...

If you need help motivating yourself to keep plugging away at your story try using these websites to help.
http://nanowrimo.org -adult section (more demanding)
http://ywp.nanowrimo.org -youth section (go at your own pace)

If you are a teen looking to get published...

If you are a teen looking to get published try out these websites:
http://www.teenink.com/
http://www.teenlit.com/
http://potluckmagazine.org/