Here are some of my favourite links. They are both informative and inspirational.
http://www.sculpey.com Polyforms website has everything you need to succeed with clay. Here you can access tutorials and fabulous videos about using their products. They are always there to help if you need info.
www.thebluebottletree.com It's all here! Everything you want to know about any clay, tools or techniques. Ginger Davis Allman answers any and all of your questions about clay products. She's super!