I would pick:
Exodus —because I have never read it; saw the movie ;-)
Mark -—because its has the most events
or
Letter to the Hebrews -— because someone suggested it here
Do we have any other interested parties?
I am more interested in the New Testament if it is to be Christian ecumenical in nature. I also prefer the Gospels to the Epistles, but it is your pick, really, since it is your idea.
I can seed it with this conversion story ping list and then see who is interested.