Auto Detailing in general can be whatever you decide you want to make it.
It can be just a quick wash, vacuum, and wax - production style, or it can be a more detailed, thorough cleaning, and touching every square inch of a vehicle.
The more you get into it, the more time and $$$ it requires of both the Detailer/Company and the paying Client.
What level do you want to take it to?
What is the median income of the area/s you plan to work in to attract potential Clients to this new business venture ?
How much $$$ are you wanting to invest in the business?
What kind of equipment do you possibly already have that can be used in the business?
The reason I ask is because I work at a very good Independent German car repair shop and get work from them constantly. I supply everything for the work, they supply at least temporarily, a space and electrical power.
Perhaps you might think about this kind of arrangement as well.. I am an independent contractor working for them. I bill them, pay them a set percentage of the cost, and they add something to it and bill the Client. It is all legal and they collect the taxes and pay the State..
Perhaps you could find a Mobile Detailer - a good one - and talk about how this could work out in your building, etc...
Just putting out some ideas out there..
Good luck with this !
Dan F