I don't work out of my home garage.
We have an established 3500 sf location, in a warehouse complex with no street exposure. But, we are very close to a major artery leading to "horse country", and the very upscale demographics. So, we are "easy to get to, but hard to find."
Today we did:
2005 Toyota Solara - Interior Only - OMG, it smelled like a Locker Room!
1962 Corvette -Exterior Only - Frame Off Restoration by others, just back from paint - wetsand and polish. (Still in the Shop -not a 1 day project...)
2007 GMC Envoy - Complete Detail
2008 Cadillac DTS Complete Detail
So, we have little time for photography (my hobby!) because we have to answer the phone, do accounts payable, do payroll, negotiate with the insurance companies, make bank deposits and keep the Shop clean and in order - and I try to limit myself to 70 hours per week as I get older. We've been doing this for 8 years now, and word of mouth is by far our best source of new clients, but we're proud to have clients that have stayed with us over the years.
We try to make the Shop appear bright and clean. All employees wear navy polos with our embroidered logo. We have a defined reception area, but yet wide open to the Shop - we want folks to see what we're doing!
I think your single biggest obstacle, and I'm trying to be sincere, is your age. I'm just not sure that the 50 year old Maserati owner wants to immediately assume you have the experience to 'manage' his luxury exotic. And, I don't have a suggestion as to how to overcome that hurdle.
Keep the the dream. Continue to learn and educate yourself.
Good Luck.