You may already have an idea as to what your car should look like when you're done but in order to take this idea to a completed form you should have a plan. Take a little time to sketch out your idea on paper. If you haven't decided what you want to do you may want to check out some possibilities. Draw your design at full scale so you can transfer the profile and shape to the wood block later.
What kind of car do want to build? Well, there are several basic types of car classifications cars that are fast, cars that are fast to build and then there are character cars. Character cars are cars that model other types of cars or objects. Remember that a highly decorative car with characters decals and other trim will not be as aerodynamic as a plain car. The sleek low profile designs will tend to have less wind drag and therefore faster. The fast car is usually not a handsome car. Don't limit your design ideas but we'll talk about the plain, more aerodynamic designs and remember, you can paint car just about any way you like.