I went with the old adage that you should write what you know. What I knew was 18th century Britain, so what I decided I would do is write a novel based on my dissertation research.
Magic has been around forever, and it's also been in trouble forever. I'm not suggesting that there was ever a time when the practice of magic was celebrated by those in power. Actually, such practices were routinely demonized by monarchs and organized religions precisely because magic is inherently democratic.
In the past, people generally believed they could acquire magic in two ways: through learning the craft, either from another practitioner or from books; or through obtaining magic from a powerful being-think Faust or the classic, demonized witch, both of whom get their mojo from Satan.
I do, in fact, have a book club. I meet with a couple of guys once a month of a lunchtime discussion of some interesting text, usually, but not always, philosophical.