May I add another suggestion?
The bestest most expensive paint that can be had wont do much good unless you have some technique.
Little things to learn like air first then paint ;)
Might I recommend getting some cheap black acrylic, Testors Aztec is good it can be had from most craft stores in 2 oz bottle. It will blow straight out of the bottle but of course you can experiment with thinning as recommended above.
Get that cheap paint, some paper sheets, and some sort of easel and practice. Look on you tube for airbrush practice drills. Things like painting dots of various sizes, connecting the dots with lines, progressive lines, and on and on.
Airbrushing is very much an aquired skill. Practice get your motor skills up to speed, then switch to the 'better' paints.
Got to learn to crawl before you can walk :)
BTW I have a patriot too its a fine piece of equipment no doubt. It is my go to for the vast majority of my work. I am glad to see you started with gravity feed.