Draw two circles under the body (use a coin as a template). Add smaller inner circles for rims.
Inside the cabin area, draw a slanted or curved line to separate windshield from side window.
Above the front half or middle, draw a smaller rectangle or trapezoid (the roof/cabin).
Draw a long horizontal rectangle or slightly rounded box (the chassis).
Add headlights (small circles/ovals at front), taillights (at back), door lines, and wheel arches (curves above wheels).