Believe and Belong is a nice little booklet by Mo Mansill and Jo Ryan includes six great session for youth leaders to use with older teens who want to explore the faith more, or for preparation for baptism or confirmation.
1. Who are we Christians?
2. What do we believe in?
3. Who do we belong to?
4. What does it mean to belong?
5. What do we have to give?
6. How do we keep believing and belonging?
This book is now out of print, but you can read it here.