If you havent had a look at this site - its fantastic(click on the picture). Not only does it give you information about contraceptive sexual health (particularly in developing countries - funny how the issues are often the same especially for young people at risk) it also has resources that you can order or even get free.
As an example I have ordered a copy of the "Family Planning - A Global Handbook For Providers" This book is soooo easy to follow. It is not made just for clinicians. It is written in simple language that will help you explain contraception to young people. The book covers such topics as types of contraceptives, serving diverse groups, STIs, reproductive health, sex after childbirth etc etc.
I think EVERY youth /community health centre should have a copy of this for easy reference. (Click on the picture on the right to go to the order page)
Lud Allen