1) In the county in which you last lived together.
2) How long do you intend to wait to file? If you just leave in the middle of the night and there's nary a peep out of you? That's abandoning the marriage. If you tell him "I'm done, you're a tool, I want a divorce.", then file for legal separation, it's not.
3) Who is the car titled to?
Virginia divorce laws are explained here.
Good luck to you.

