Paint job help

gallon is what I was thinking, Its gotta look better than it did, Im not expecting miracles, Im not sure what reducers are used for, or how to mix the hardner.

The paint will have instructions on the gallon container and do like DaveBonds said and do a fog on coat all over (I would hit the hard to get to places first, like low area's and inner fenders then walk around it with an even thin fog coat, then let it tack down a little then start a even spray not to fast and try and get 4 coats on, I add a touch (a cap full) extra hardener in my last coat, it seems to wake it up and lay down flat... but remember I am no pro at this , I have dun it back in the day :D