I came across a great tutorial for Audacity. It is video and walks you through many of the essentials of working with Audacity.

The topics covered are:

-Recording Setup

-The Editing Tools

-Basic Editing and Trimming Your Audio

-Adjusting Levels

-Importing Audio and Adding Music to Your Podcast

-Saving Your Project and Exporting the MP3

The tutorial is based on v1.2 of Audacity. (as of this post, v1.3b - beta is available) Check it out and let me know if it was helpful