I’d say first of all the Modeling Bootcamp. Pay no attention to having the old Blender interface, the course teaches core concepts more than pushing buttons:
https://cgcookie.com/courses/blender-mesh-modeling-bootcamp
Then retopology probably:
https://cgcookie.com/courses/retopology-with-retopoflow-3
And probably the modeling phase of the Human course:
https://cgcookie.com/courses/human-realistic-portrait-creation-with-blender
