I really like this simple intro to Moodle by the University of Minnesota. It follows a logical learning curve. It starts with some background about Moodle, follows with an introduction to the look and feel and then provides additional links to the various tools and resources available at UofMN.
If you’re looking for ideas on how to structure your own Moodle tutorials for teachers, this might be a great place to start. Below you’ll see a screenshot of their organization, hit the link to browse at your leisure [http://www1.umn.edu/moodle/index.html].