OK... I used to have an Aztek.
I mixed about 40% Acryl thinner into the paint... that was usually about right. Use the Black or White paint heads... the white one is higher flow.
I use Testors Acryl cleaner... but NOT the bottles they sell in hobby stores for $5 for 4oz. Buy it directly from Testors (their web site look under Airbrush Accesories) and get the 32oc concentrate for about $14 including shipping. It makes 3 quarts of cleaning solution!!
http://www.testors.com/default.asp
www.naplak.com/modeling ... a free site for modelers
www.scalehobby.com/forum/index.php ... a nice Modeling Forum