Hi, I noticed when testing that if you have a racing wheel or game controller connected, it can mess with the camera controls, so that might be the issue.
Using the left and right arrows keys while in the car should turn the camera left and right. On the left there are two pistons, one for brake and the other for gas. When you start the brake is fully engaged, so you have to mouse over it and scroll to release it. Then you can do the same on the gas piston to start moving froward. From there you can look to the right and see the steering column. You can mouse over it and scroll to steer the car. The cursor should change to scroll cursor whenever the mouse is over something you can scroll on, and turn yellow when there is something you can click on.
Hope that helps!