First time painting help!

ok so I am going to be painting a car for my first time. 93 Mazda 626 it is my sisters car, I have a gravity feed paint gun, a garage, and compressor.

now i know the basics of painting and everything.

but I would like some pointers, tips and what nots.

Also I want to know how to mix the paint, what ratio paint/thinner.

My mom is going to be buying the paint and im doing the labor.

I todl her 1 gallon primer, 1 gallon paint, and a gallon of thinner, and gallon of clear coat (if all goes well I plan on painting my beater also)

I am going to ruff sand the car, then lay 2 coats of primer
lay a coat of paint, wet sand and do again. until I get the color, shine that I am going for.

then on to the clear, wet sand..

I think I have it, but not sure. thanks in advance!