Some really good advice here so far...
It's too bad you're first for-profit detail job sounds like it's ready to go to Maaco
For what it's worth, when someone asks me to detail their car and then when I look at it I can see it's never been taken care of in the past, the first thing I wonder is
What's changed that now the owner is going to take care of the car?
Usually the answer is
'nothing'
That means even if I take the job and restore a show room new shine to the car, it's likely going to just go downhill again because the owner is going to do the same thing to it that they've been doing all along.
That's kind of sounds like the type of person your new, potential customer is going to turn out to be.
While it can be exciting to have your first customer, it's more exciting to have a customer with a car you know they'll take care of after you work your magic and also a car that has some paint on it to start with.
It can be hard to do but maybe take a pass on this opportunity if you can. If you can't then keep it VERY simple.
Wash, clay, use a light cleaner/wax, dress the tires and clean the glass inside and out.
When you use the cleaner/wax either apply it by hand or use a polishing pad with your polisher, DON'T aim for a show car finish, just shoot for shiny paint.
