What makes ministers? (And remember -- we're ALL ministers.) Many things, of course, but at least these two:
1. Models of ministry.
2. Opportunities to experience ministry.
When I was a teenager, I learned from Pastor Jim Cook of International Baptist Church in Honolulu how to lead people to Christ, how to nurture them, and how to use my abilities for ministry. As for ministry opportunities, I was given the chance to lead music, work with the youth group, and even preach/teach.
Above all, it's the Lord who makes ministers. He is more concerned than we are to thaw out our frozen assets for the kingdom!