The comic book author and follower of magic describes how to get started in magic, for those into that sort of thing.
I discovered this article after falling into a google hole after watching Under the Silver Lake, from some thread somewhere that said the protagonist was creating sigils. Magic also sounds a lot like the ideas in Sapiens and Think and Grow Rich:
Magic is easy to do. Dozens of rulebooks and instruction manuals are available in the occult or “mind, body and spirit” sections of most modern bookstores. Many of the older manuals were written during times when a powerful and vindictive Church apparatus was attempting to suppress all roads to the truth but most of them are generally so heavily coded and disguised behind arcane symbol systems that it’s hardly worth the bother—except for an idea of how other people used THEIR imaginative powers to interpret non-ordinary contacts and communications.
See the link.