Burke, I just bought the Muller/Koehler book charcloth mentioned (I have been playing for almost forty years and never learned to double thumb!) and I agree that it is excellent. It is a Mel Bay publication and I bought my copy at Music Folk in Webster Groves, Missouri. Hopefully Muller's double thumb lesson will get me going. I would ordinarily NOT suggest a book but this has clearly performed examples on the CD and the tab is easy to follow. I struggled with the Pete Seeger book when I first wanted to play and gave up on it for "in person" learning.
I think the Saga 10 is similar to my "kit" and if so it IS a good beginner's banjo.