Airbrushing Tutorial

You might try this:

http://airbrushtips.110mb.com/index.html

And this:

http://www.howtoairbrush.com/

This one is aimed at modelers. But it may ask for a monthly subscription now.

http://www.promodeller.com/tutorail-videos/

The Airbrush Magazine site also has many video and they are free. They are more geared toward artist, but the basic are helpful to modeler too.

http://www.howtoairbrush.com/index.php/site/videos/C12/

Come back to post how helpful you find them to be.

For videos, I'd say it would be hard to beat Brett Green at Testors workshop, even though he holds his airbrush funny. Also this site has a lot of videos of  models being built by experts.  It's in Japanese, but not hard to follow and fun to watch.

Don