Gordon's post on publishing better than Crowley is pretty wicked stuff.
I'd like to add a trick for would-be occult authors. If you haven't noticed yet, a blog is a book nursery. Ideas are spawned, developed, organized and published, in nice chapter-length sequences. They give you a place to hone your craft, and help people at the same time. Writing a post at a time is less daunting than a whole entire book, and after a year or so of steady blogging about whatever you're magically dealing with, you'll have a manuscript's worth of material ready to go on a cohesive topic or three.
All it takes is editing at that point, sewing it all together into a pretty little poppet, and you're good to go.