BeemerBoy above said it best !
It is a big commitment physically and dollar-wise at the start, so you are already behind at the blocks.
Getting a place to do this with enough lighting, facilities for water, drainage, heating and cooling at appropriate times, Liability Insurance, and a Business License, Rent/Lease payment, getting the Ok from the Nazi Homeowners Assn., and your Neighbors, if you decide to try it at home, a big chunk of change to get supplies, to enable you to hopefully Detail a few vehicles before you have run out and have to replenish some things. You will always be doing a load of either cotton or microfiber towels, when it is extremely busy..
I have said ad-nauseum, how I started and will not bore anyone again with those details.. My plan worked so good, I get existing Clients back or new Clients almost every day I am at the Shop...
At the end of the day, you need to be able to come up with a theoretical $$$ number you project you can make to pay all your bills - all of them - and leave you with a certain amount projected by you, to put into your Bank...
Good luck with your research !
Dan F