All the previous suggestions are valid, but if it's the first time i would take a minimal approach. Have the car set up as best you can before hand then take a jack, basic hand tools, some snacks/drinks and just get used to the track experience and have fun. If you have a issue then just pack it in and take a few more things next time. Your not there to set a national record....lol. The more times you go the more you'll know what you need. Don't overwhelm yourself and miss out on the learning and enjoyment of it all. You'll also be surprised at the help and tools fellow racers will assist you with if need be. Just go have fun.