Here are a book title and some tips from my experience:
"How to Photograph Cars" by James Mann is a 142-page book (plus a one-page) index published by MBI Publishing Co. ISBN 0-7603-1243-5
I bought it in a bookstore, but apparently it also can be bought from the publisher. Here's a url:
How to Photograph Cars - by James Mann
Its chapters are Equipment; Basic Camera Techniques; Preparing The Car for the Shoot; Action Photographs; Motorsport Events; Groups of Cars, People and Cars, Studio Techniques; Restoration Photos; Shooting a Magazine Feature; Photographic Archiving.
Perhaps your local camera store, public library, car dealership or some other venue will host either your one-person show of car photos or a group's show — perhaps in conjunction with a car show. If the photo show is promoted with announcements at the car show and also in news media before and during the show, that could increase attendance.
Also:
Sometimes a person or persons (spectator or car owner) in the photo adds to the image. For example, at a recent outdoor show, a man lying on the grass in front of a custom car was peering at the undercarriage.
Consider photographing nostalgic items displayed on or in cars at shows. Some examples: stuffed animals, drive-in trays holding fake food and root beer glasses, and personalized license plates.
Take a camera to indoor shows despite the cramped conditions and poor lighting. Although my photos of a Bugatti Veyron won't be in any magazine, I'm glad I had a camera with me at the indoor show where the car was displayed. I might never see another Bugatti Veyron. I waited until no spectators interfered with the view.
Sometimes a car cruise is associated with a show. Cruises provide a chance to get photos of vehicles in motion and not crammed into a tight space, with one car interfering with the view of another. Also, sometimes cars can be photographed entering or leaving the show area, or lined up for the cruise.
Sometimes cars in the parking lot are as interesting as cars at the show. I got nice shots of a Ferrari in a grassy parking lot before a show.
If the car owner is near his or her vehicle, I ask permission to photograph the vehicle, and I chat with the owner. It is fun, and I learn neat stuff.
I'll make a DVD of car show photos and give it to nursing homes and perhaps a VA hospital or someplace else for the enjoyment of folks who can't get out to car shows.
Best wishes!