Van,
Whatever you do, bring food. For the section. They will love you and listen to you if you bribe them with food.
Do things in small sections...I know that with the trumpet section at my school, the longest attention span is about 6 minutes before we all break down laughing over something.
Have fun, and don't be too pushy. I've had section leaders in the past that were like, 'YOU HAVE TO DO IT MY WAY RIGHT AWAY RIGHT NOW OR I'LL MAKE YOU PLAY 3RD!!!'. Don't do that....it will only make the section hate you and overthrow you and anarchy will reign. It isn't a pretty picture.
Drinks are also a good idea. Powerade, gatorade, juice. Just don't give them anything caffinated. You will regret it. Trust me on this one.
Make it fun and worthwhile to be there...don't bring out your cane named Lara and start hitting the poor kids over the head. That won't get you anywhere.
Lara