Educate yourself. Search the library or Internet for information on child and youth mental health. You can find good information at: http://www.knowledge.offordcentre.com and extensive lists of relevant books at http://www.communityed.ca/booklists.cfm
If there is a crisis or emergency call Crisis Services at 1-800-263-4944. This service is 24 hours a day, 7 days a week.