Agree with the great advice you've received thus far, and I'll also add to leave the laptimer at home. For your first day, even first several days, speed and laptimes shouldn't be a point of focus. Focus instead on being smooth. Work on getting the lines correct (there is a correct line, and following and talking to the CRs, you'll learn it). When you can hit the same, correct line and apex over and over you'll be predictable to fellow riders, which is important. Grab a CR and have them show you the correct body position and work on that. Those few things will be plenty to work on your first day, trust me!
Have fun!!! I haven't been down south in awhile, but RA and VIR are both awesome tracks!