This is what works best for me.....
Make sure you sand the car well...removing molding lines etc. Finish off with 1200 grit paper.
Before painting, heat the can up in hot water for 10 minutes so it flows better from the can.
2 Coats of white primer. First coat very light, the second so that it covers the model. Dont be to fussy if it still looks a bit "see-though"
Leave for a week to harden the primmer.
3-4 Coats of finish coat about 5-10 minutes apart....thats it...nice a simple.(keep the can warm)
The first coat is a vey light mist coat...the paint should only just be landing on the car.
Do the same for the second coat
The third coat you can spray a bit more heavy.
The last coat is the one you want to get perfect.
I always spray the front and rear bumpers first...then both sides along the whole length of the car body.
Then the last bit i do is the bonnet/boot and roof last
Dont bother sanding between coats as i dont really see the point...all you are doing is making more dust and removing half the paint you have just stick on.
After you have finished the last coat...leave for 10-12 days.......rub with some compound then finish with a wax.
Or....you can look in the FAQ
http://www.automotiveforums.com/vbulletin/t45619.html