Replacing my old car

Hi to the community ! I am thinking of getting a 2014 Mustang and sell my dying Mazda CX9 (it really is dying, engine is coughing when I’m driving).

2 questions : - Is there anyway to hire a Mecanic engineer somewhere to inspect the new car when I test drive it? - Is there anyway to sell that old car easily, I don’t try to get a good price off it, I just don’t want it anymore, I am thinking a garage for instance would find something to do with it.

Thanks