I'm not sure you'll need spares, but having a back up plan if you bin it might be a good idea.
Otherwise, get the bike in trim. Do all the adjustments, checks etc. Oil, chain, levers, make sure it's all nice and tight and running well.
Make sure you've got all the gear and are used to wearing it.
Get a roll of duck tape and learn how to switch off the lights (if you have a pointy) using the fuses. Learn how to remove the mirrors.
Finally, make sure you have ok tyres. They are the most important bits of the bike! Find out what the recommended track pressures are. They'll probably have a compressor there so you can pump them up again after. Decent road tyres are more then fine, don't bother with race or ultra sporty tyres.
Once on the track, take time to learn it. Build up your speed session by session. Don't go balls out straight away, and relax. Your unlikely to injure yourself if anything goes wrong, because your on a track with good runoffs, no obstacles, marshalls and you're wearing all the gear.
Enjoy!
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