The only thing you need relating to flying is your certificate and medical, because your going to be typed.
Headset, knee board, flashlight, not needed.
Maybe a flashlight. We are required to have one, and some FAA inspectors don't count the ones installed in the airplane.
Bring an open mind. The dude who may appear to be a Dbag, maybe the one to leach to for info. Or they may just be a Dbag.
Get a class roster with contact info on day one, not sure if your instructors are that proactive,
Have beer/pizza study sessions at night.
Get to know your classmates.