Usually, when someone has depression you take them to a psychiatrist and give them therapy. However, this is when the situation gets critical. I would suggest reading the book: "What Young People Ask" Vol 1 found free on JW.ORG. On the Index, there is a chapter that says: When will this End? It can help people with suicidal thoughts. Also, at JW.ORG you can find useful info for what you are looking for. Just click where it say's young people. Hope this is helpful! :)