I would not squander this great opportunity for you to get to know some of your families and vice versa.

Topics:
Instrument Acquisition
Required supplies
Calendar and commitments
What to expect in the first few weeks
What to expect in the 1st semester
Establishing an appropriate practice environment
Quality over quantity home practice
Importance of positive reinforcement
Clearly define the best ways to reach you

Maybe make it an icecream social? Someone brings tubs of icecream and everyone else brings toppings to share?

So many ways to make this a positive first impression for you!