Hydrate..... I usually start about 5 days before, I cut out my coffee and soda and drink a lot of water.
Sometimes it's hard to sleep before a big trackday or race, so sometimes I take a benedryl early enough for it to completely wear off by track time.
So you don't forget ANYTHING, maybe have everything in your garage on the floor or living room.
boots (I have forgotten this before once arriving at the track)
underarmor (highly recommended not just to keep you cool....but much easier to remove leathers after you have been sweating)
bike key (forgotten this once as well)
cooler and drinks/food/snacks
fold up chair
canopy (if needed)
tire pressure gauge
probably some other things for you..... but those are some of the basics.
Have fun out there!!! You will be excited but also nervous, it's normal. Hardest things to remember is to breathe.....stay loose with your arms(relax), try not to go too fast. It's hard to learn the proper technique, lines, braking points, etc while trying to go warp speed.
2015 ZX10R - Archer flash+goodies - Arrow - TechSpec lock kit tank pad - Spiegler lines
CL Pads - 520 kit - LSL sliders & rearset - Yoshi case guards - custom seats - Gyrocam GoPro 4 Silver