I spent my childhhod watching my dad spray cars and just cpied what he did and picked up tips from friends in bodyshops over the years. Remember spray painting relieson good prep work if your preping is crap then you'll never get a good finish with the paint.

Also take your time never rush the job, i'm no expert so i'll probably get shot down here but also a tip i've found to be good is aways make sure your paint is warm. I usually stick my spray cans in a bucket of hot water.

I've recently bought a compressor and spraygun so i'm yet to try it out but i intend on practicing on some sheet of card to get the spray pattern right.