The Learning Center for Camtasia has several video tutorials on the use of Camtasia. You can get an overview, learn how to record, edit, produce the video, how to share it.

http://www.techsmith.com/learn/camtasia/getting-started/default.asp

You can download this PDF and it will give you step by step directions for creating a Camtasia project.

If you want to check out the user forum, you'll find tips and tricks and answers to frequently asked questions. http://forums.techsmith.com/