Everyone starts out sucking at it, especially if you are using acrylic paint, as they are much easier to dry and clog. Keep at it, it gets better.
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I agree with Waikong. I only use acrylics and it took a minute to figure out the correct ratio that works for my airbrush. Even for Vallejo Model Air paints which are made for airbrushing, I still needed to thin it and find the right air pressure for what I was doing at the time.
Just got the Iwata Revolution today and went to hook it up. I attached a quick release adapter and no air! Does this need a special adapter or is there something else?
Shouldnāt need any adaptors as long as the quick disconnect fits your Revā¦
Guessing here based upon the description of the other airbrushes you used.
Unlike the battery powered and similar style airbrushes, you have to push down on the trigger to start the air flowing through the airbrush and hold it down while moving the trigger backwards to move the needle and start the paint flowing.
All the previous brushes (3) that I have are dual action. So thatās not the issue. The issue appears to be that the Iwata wants a particular quick-disconnect. It works fine if directly attached to the compressor, but no air if through a quick connect.
I bought a battery powered brush from Spraygunner that works just fine and Iām still using it with my Airtech. You might check the specs on battery powered units. Even Iwata sells one.
Thatās why guessing is a poor substitute for troubleshooting. 
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Could you post a photo of the connector?
One thing I learned is not all quick disconnects are the same! I purchased 2 packs from Amazon and each pack has a slightly different taper on the male end.
The QC that would not work was a millimeter or so shorter than what the Iwata wanted. I had ordered a 2 packs, and different times from china before the shutdown. One of the QC worked. The amount of down stroke is limited by the QC. I might buy one from Iwata ti see if that works better.