How can you animate wheels of a car drawn on AE? (Set a car in motion)

I'm fairly new to AE and I'd like to know how to animate this car I traced to appear like it is in motion. I traced a picture of a Mercedes Benz on AE and put it on a new composition. How can I make the wheels turn? What modifications do I need to do and if I need to start over, how can I achieve this?

Here is the link to the file for reference:
10973_animatecarwheels.aep.zip