Downloads
You can download Audacity Audio Editor from here.
When you download audacity, you can also download a LAME Encoder that will allow you to export your work to MP3 format.
Full instructions are provided on the website as to how to install the encoder.
You can find sounds on the internet by clicking here.
Look at this page to find some sound clips, click here.
Example Interviews (that can be chopped up and edited:
I have produced two "Timeline" documents for you using Microsoft Publisher, you can use these to layout your clips and show where effects may be added and where sound clips will be placed.