Many years ago there was a famous (or maybe infamous) auto salesman in Detroit. He ran a simple ad that was something like;
"If you want to be sold call me!"
In my opinion - oops here comes another one - the secret to selling cars, as a sales agent rather than a dealer, is two fold;
A) Learn how to sell so that once you get a live "UP" (as in walk up) on the lot you close a decent percentage, and;
B) Learn how to build a database of interested prospects that you market to - you must have a value they want.
ASK YOURSELF THIS; Would you read a great newsletter about cars if one was sent to you for free? Then ...
Perhaps your love of cars is one you can share with others who feel the way you do. A newsletter every month would be very appropriate and, since you would be in the car business, you would have access to car shows, test drives at competitive dealers (you can just show em you sell cars - they will want to steal you!) and much, much more. Plenty of inside stuff to make a newsletter each month.
Of course, once you understand marketing you can sell much more than just cars. The first thing we do in direct marketing is; sell the system to others (car dealers/agents), as in; DO IT, THEN SELL IT TO OTHERS.
In other words - when it works you can license the newsletter. As it happens I have developed the most advanced technology in the world to personalize newsletters from the sender and to the receiver. The SALES and MARKETING SYSTEM that I employ would work well to do this. Contact me and I will show you how it is done, it is quite fascinating actually.
All the very best to you.