Children forced to fight wars that they want nothing to do with is one of the worst crimes against innocence in existence. Some resources to help stop child soldiers are www.invisiblechildren.com, www.amnesty.org, www.boyerspond.com, www.crisisgroup.org, www.farreachingministries.org, www.guluwalk.com, www.hrw.org, www.irinnews.org, www.ird-renew.org, www.namecampaign.org, www.ugandacan.org, www.ugandamission.org, www.worldvision.org.
You can read the memoirs of people who have survived being child soldiers in the books:
Long Way Home, by Ishmael Beah
Girl Soldier, by Faith J. H. McDonnel and Grace Akello
First They Killed My Father, By Loung Ung