Hi action, try this, remove the paint bottle from the airbrush. Press the triger down for air. Is there air coming out of the front of the airbrush? If not, then the air passage to the head is clogged. If no air comes out, use the larger size wrench that came with your airbrush and remove the outer head unit. Now lookat the brass colored end of the airbrush body. There will be 3 very small holee in the end. These holes are where the air goes through. I sounds to me like these holes are cloged. You'll need to find something that is thin enough and stiff enough to push into those holes to clear them. I use airbrush cleaning brushes from Harbor Freight, the smallest brush is small enough to go into those holes.
Did you buy the airbrush brand new? If so maybe those holes were not drilled all the way through when it was manufactured. I would return the airbrush to where you bought it and get another one. Or contact Paasch and they should make good for it. Hope this helps and let me know how you make out.