it's okay to be very slow on your first event. i was discouraged with my 80s on a 60s course, but whatever. last week i was 2 seconds behind skierd and that was my second event. hopefully tomorrow will be even better. just keep going out there time after time and build your experience.
completely stock is a great way to start. it means you havent wasted money on modifications to your car that you dont need or that hurt you. good luck
if you're looking for a helmet, check out http://www.extremesupply.com/bellhelmets/bellmcyc/bellhelmetstourlitesc.htm
59$, free shipping, free helmet bag. make sure you get the right size by using the sizing chart: http://www.extremesupply.com/bellhelmets/bellmcyc/sizing.htm
that price will get you a Bell Tourlite SC - Solid Black Helmet that is DOT and Snell M2000 rated.
have fun!