Well, your question was contradicting... and in this world, it doesn't help for people to NOT give you the honest truth, especially if you are going to invest in a business.
I would rather someone critique by work with honest feed back than say it's OK because they don't want to hurt my feelings.
You say you are not a pro, but not an amateur, yet you don't know what body, lenses, lights, filters etc to use for car photography - take some time to read the net as it's filled with that information.
You say you've taken some great pics, yet you don't know what equipment to get.
Those two points just killed it for you.
Also, if you're starting out in business for yourself, you should consider a business case, what's your target market, audience etc etc... figure that out for yourself, then you can search the net for current prices etc and figure it out. Also, simply sticking some pictures on the net isn't going to get you business.