How to go about cleaning strangers cars?

Ok soo my friends have been recommending i start detailing strangers cars since im getting a bit better. However I still have alot to learn and im not sure how id even go about it? Considering im not sure what detailers do and dont usually do/include in packages. So just some questions:

• are detailers expected to polish cars in a full deep clean? I've never even touched a polisher to save my life and im worried about damaging paint

• do detailers do headlights restorations as part of an exterior cleaning or is that separate?

• when cleaning inside, what types of packages do u guys have?

• how long is it expected for a detailer to work on different segments of a car? Since im still learning im really slow (like 2 hours to fully clean a car exterior and apply ceramic spray wax)

• do u guys "warn" clients of stuff? Like say a car is very dirty and never been cleaned; do i warn the client hey its possible u might see small scratches once the car is cleaned, but thats because some of them r being hidden by the dirt now and not caused by me