Your job is not only to conduct well, but also to lead well. It takes both to be a good Drum Major.
Conducting, sure takes practice.
But a lot of people have false perceptions about leadership. If you've never heard of it, the best thing I've learned is that a leader is actually a servant, thus the name of the ideology, servant leadership. I could elaborate if you like, but right now, I'm too tired.
And have fun! Like Dan said.