Molly, how about browsing the aforementioned
rapidly growing list of available stories to see what strikes you?
Peggy... welcome! Very cool to see this project bringing in a new face, and I love your enthusiasm.

Thanks, too, for the comments on my efforts. Much appreciated.
As for longer stories, there are a couple currently being worked on. Might be a little while, but be patient. They'll get there...
Wanda, we've already been in contact, and I'm glad to see your progress.

For others who may be reading this... Nope, you don't need anything else. Garage Band seems to work just fine. As you've noticed, LibriVox even has some tutorial information for it.
Paul