here's a You Tube video: How to Sew: Using a Serger : Introduction to the Serger Sewing Machine
http://www.youtube.com/watch?v=svBmI7bpw1s
and How to Sew: Using a Serger : The Mechanics of a Serger Sewing Machine
http://www.youtube.com/watch?v=u3HN1Sd2Rvk