The riders meeting is where you discuss flags and then break out into your group with instructors. Ask the specific time/location from your tech inspector or an instructor running around.
The classroom session is basically an informal discussion about the previous session. There is no formal teaching with textbooks or a classroom.
My only difficulties and were logistical. You enter in gate 3, sign the waiver at a guard shack on the right. Then continue straight, and turn right into the paddock area, marked by a blue sign on the chainlink fencing. You then turn left into the middle paddock area, which has paint lines on the ground. Depending on volume you can continue straight into the lower paddock/garage area (#10 on map). You check in at a small information booth (#13 on map), then they will give you a class sticker and tell you where tech inspection is (if they don't, ask). Take your class sticker to inspection and put it on your bike. If no one shows you before leaving the novice group meeting, ask how to enter/exit the track from the garage area.
a cooler with water and snacks
the key to your bike!!
tire pressure gauge and air tank if you have it. Otherwise I'd air up to stock pressure at home and get some advice from coaches/riders once there and air down to recommended pressures.
Everyone is usually really friendly and there to have a good time and help each other out. I went my first time without knowing a single person and within 15 minutes I had three new friends just from people walking by and saying "hello". Plan to get there just before tech opens so you have plenty of time to unload.