There is no state law prohibiting OC in Virginia.
Many new OCers have posted that they feel the nervous their first couple of times.
Firearms and vehicles....
Be sure you know the law for the locality you are in as it might be restricted in some way. Generally, unless you have a CC permit.... it is best to have the gun out in the open so an officer can see it if you are stopped. You do not want him to think you were trying to hide or disguise it.
I think many here place it on the front passenger seat.