Check out Adorama in NYC. There are also inexpensive setups on ebay. I used to be a professional photographer and did a ton of cars and motorhome pix for advertisements so if you want to pick my brain pm me and I will give you my phone number.
You will most likely want strobes with modeling lights running into umbrellas or soft boxes to start with. The more watt seconds you can afford the better. To do a pro job, you will probably want at least a half dozen light sources, but you can probably start with 2-3 if you work hard at staging. Shooting outside means you are at the mercy of the sun and clouds. Large scrims help alot, and you can build them up yourself for a few bucks. Also, a can of dulling spray can really be handy in taming reflections.
Heck, I still have a 4x5 sitting on the shelf that hasn't been used in 20+ years.