In my experience dealing with body shops, they are constantly trying to get through cars all the time--and can have difficulty keeping good help. If it's something you're serious about, there will be a definite need. Certifications a plus, and you could even additionally have the different car manufacturers' certifications (a local dealership can sponsor you).

Sounds like the father/son duo is a great idea. Just have both of you go through the ASE certifications minimum plus your schooling to make it more official. Also, it would make a great direct mail piece to have a photo of you and him, as prospects will instantly feel more comfortable and good about supporting you.