Also, the only thing you'll need to bring to the first auto-x is your car and money to cover the entry fee. A helmet would be nice if you have one that is Snell 2000 or 2005. Otherwise, loaner helmets are available. Also, make sure to dress for the conditions. Usually its really hot and windy, and you're standing in the sun for quite a bit. But, early in the season it can be just the opposite. It'll be cold and windy (and possibly snowing).
http://www.renoscca.com/Solo%202/Sur...%20revised.htm
Here is a guide from the Reno SCCA on what to expect on your first time out.