Guys Small Group Studies

I have heard good things about this:
http://store.hillsong.com/store/products/curriculum/shine-strength/strength

Back when I was in high school (in the 60s) there was a set of studies done jointly by the Serendipity organization and the Fellowship or Christian athletes. It took a Bible passage and used it as a basis for personal reflection. I haven't seen anything quite as good since. The original booklets have been out of print for decades, but the Serendipity Bible seems to have most of the studies, as inserts into an NIV Bible.

I use these successfully to start sessions in a junior high Sunday School class. Unfortunately they don't always have the passages I want to use, but I've found that I can imitate the approach.

I would suggest asking your teens what questions they have and starting there. Start with the pressing questions, and then lead them into maturity.