before primering you want to sand down the whole car, you want NO shiny spots where you are going to spray cuz nothing will stick, the material will jus peel off very easily. when you scuffed down the whole car u can primer it, sand down the ALL the primer with 180grit or higher, then spray another coat of primer and sand it down with 320. the way u sand the primer can either make or break your paintjob becuase you could leave alot of bodywork lines showing in the paint(especialy in dark colors)
anyways, after your done primering and sanding it, you can paint(after youve cleand the car very very well ofcourse). base coat is the easy part. jus spray one even coat at a time, not too wet not too dry. and after every full coat let it dry for atleast 10 minutes depending what conditions you are painting in. 3 coats and you should be set. now, clear coat is the hard and nerve racking part. it sprays on the panels wayy differentent then the base coat. watch how it is setting on the panels. its pretty hard to explain how to properly spray clear on a car. except you wanna spray slower then u did the base but if u go tooo slow youll obviosly have alot of runs. But after each coat of primer, samething, let it dry for a bit, then spray another coat, you should be good with about 2 or 3 coats.

i would recomend just finding someone who has atleast some experierience in painting cars and let them do it, and learn from them.

or spray on a piece of random metal (prepped for painting like your car) and practice on that.