I used to be a "pro" if that means I made my living doing it. I had two dirt tracks that I was track photographer at and shot weddings, reunions and such but that didn't mean squat when it came to model photography, as a lot of my early stuff painfully proves.
I've seen some wonderful model pics shot by rank amatuers and some barely passable ones done by some really great pros. Sometimes it's like comparing apples and watermelons. LOL
The indoor stuff with the three or four light system is beautiful but it doesn't appeal to me. I've seen some really nice model pics that looked just like the auto maker's stuff from the '50's and early 60's done that way. But I guess that with my background as a racing photographer I'm kinda partial to the sun for my lighting.
What you have to watch out for in closeup photography is the depth of field and the background focus. A camera can't tell if it's a foot away from a model car or twenty or thirty feet away from a real one but the blurry background will tell on you every time. The trick is to use the smallest aperture (biggest number, I know, it confused me at first too) and focus the camera at the windshield post on a front 3/4 shot. That's because there's usually more in focus behind the point of focus than in front and there's also more car behind the windshield post than in front of it.
If you use that focus point and bright sunlight then the depth of field (what's actually in focus) is usually enough to get even the background in focus and lend realism to your shot. Now let's get our "location" done the easy way.
Cheap flat black or dark grey primer dry-sprayed on styrofoam or cardboard looks an awful lot like asphalt when you put a model car on it and you can just find a picture from a calender of a lake or something to use as the background and it makes a convincing shot.
If you keep your eye out and think "in scale" as you go through the day you can "see" some pretty amazing things to use for a photo "set" for your models. This pic is taken on a sheet of styrofoam sprinkled with HO scale railroad ballast with a chain link fence made from the metal mesh in a used real car air cleaner on bent coathanger wire frames. The privacy fence made of saved popsicle and corn dog sticks. Total expenses- less than five bucks for the ballast and some adhesive and a couple hours work.