Borrow one... If your really stuck.. I can probably help you out.
Motor cycle helmets are fine.
For your first times at the track... I wouldn't mod your car.. Your just learning how to drive. HP is not important in this case... The slower your car is the easier it is to learn the line and breaking/accel points. 5pt is $60 from Summit racing, and an easy install.
Also if anyone can't go but knows someone who might be interested send them to the site or contact me at
mightymiket@netzero.net