If you are in the LA area (my old stomping grounds) Karen Cope is the person I would suggest going to for classes. Take a look at her website and see what I am talking about.
This is a how to about figures sculpting DVD. The DVD is titled beginning figure sculpting. It is almost two hours packed full of priceless information.
Studio Realism has a vast collection of tips, videos, how to sculpt DVDs and articles, and more! The information on this site is good for fine art, hobbyists, polymer clay sculptors, and students.