Don't know whether you'd want to direct beginning callers to this, but folks on
this list might also enjoy the articles by Richard Powers, including this one on
teaching dances:
http://socialdance.stanford.edu/syllabi/teaching_tips.htm
His particular field of expertise is teaching vintage social dances, not
particularly aimed at contras, and much of what he says here is aimed at people
who will be teaching in a class setting, not at a public dance. Nonetheless, he
is an experienced dance teacher and has much of value to offer.
David Millstone