We will start on the rims. Create a tube in the side view with 1 height segment, 1 cap segment and 20 sides. Convert it to an editable poly like you did with when you started the body of a car. Select the polys shown in red and delete them leaving just the ring of polys on the top.
Now edtrude the green edges a number of times in the direction of the red arrows to get the start of the rim. This is just an easy series of extrudes. The top picture shows a cross-section of the rim to give you a better idea of how I extruded the edges.