One barrier to using Moodle is that first time users often don’t understand or recognize the interface (the learning curve can be steep). To combat any unfamiliarity with a new interface, ilite (at http://ilite.wordpress.com) created a script that redirects users logging in for the first time to a special page that hosts helpful training and tutorial information.
More information can be found at the original blog posting: http://ilite.wordpress.com/2009/12/20/redirecting-new-moodle-users/
Note that you will need access to your Moodle index.php files.