As I've said before, I'm no expert at using CSS (cascading style sheets—a way of coding your blog template, like HTML but better). I've figured out a few things through trial and error. I'm still trying to work out some kinks in my Bonny Glen design (a Typepad blog).
This CSS Tutorial, recommended in Typepad's Knowledge Base, promises to be helpful. As I work through it (slo-o-o-wly, I'm sure), I'll share tidbits here.
Typepad is giving some good pointers also, like this explanation of how to add a background color to a Typelist header.