Some good info has been given, but there has been one bit of information not shared that you should do before you go...work on that organic thing behind the wheel.
Yes, get a decent set of pads (hawk ro carbotech), go to a high temp brake fluid (Motul 600), Change all your operating fluids (including diff.), make sure you have good tires at the right PSI's and
find the right school. However, you need to make sure you are just as ready.
Driving on the track at high speeds is much different than "spirited" driving on the streets or a twisty road. You must be aware of everything around you, your vehicle and your anxiety level. Your visual referrences, your breathing, your space management, etc. are all critical to avoid metal to metal contact.
Once you pick your event, take time to study the track (
www.trackpedia.com) and perhaps watch some video on the track on you tube. Although I would caution you, watching video can be a bad thing, too. So idiots post video of their laps and their lines are horrible. Look at the track and note the dark and light parts of the track. What you are looking for is the most popular line, which will be noted by the change in color. I also look at the over head on google/yahoo maps. Amazingly, you can see the line if you zoom in kind of close on the page. Once that is done, mentally drive a lap or two. You will be amazed at how much detail you can pick up, how much you will remember when you get there and how much more relaxed you will be once you get around the track a few times.
Lastly, take supplies. Make sure you have repair tools and back ups. Make sure you have all your fourms and any other items you may want to have with you the night before. The first day you go to the track is exciting and you will be rushed to get there and get going. But there is nothing worse than not being prepared.
Lastly, and most important, have fun and be safe.