You are in real trouble my friend.
Cause after one you're gonna be hooked and what a sweet bike to 'track' on.
Drink LOTs of water and when you think you're gonna drown, drink a little more. And don't forget to pee before a session, park near the bathrooms. Dehydration is insidious and will cause great harm to your skills and reflexes before you realise you're thirsty.
If you're worried about being in the way, remember Mongrel's advice. "fast as possible in the corners and moderately slow in the straights" should be your montra for the day. And DO NOT freak out if you find yourself in a corner and someone is beside you. DO NOT LOOK at them or you will crash and take them with. The weirdest thing I experienced at my first track day was being close to someone else at speed. It's weird but control your emotions and thoughts, stay on the line you started, don't jump, relax.
If there isn't instruction as to what lines to take on that particular track, ask questions and try to follow someone faster than you while staying within your limits. You can also try to find some race footage from that track to get an idea of what the fast line should be like.
Have fun and don't worry, your biggest problem in the novice group is gonna be how to pass the other people who arn't following your montra.
Have fun, you'll love it if you let yourself relax. You can always break the track record next time.