You could publish a free ezine or newsletter and charge for a subscription for a print edition delivered every month. Put additional premium content in the print edition, similar to how you would do a subscription ezine. The added benefit of a doing a tangible print version is that you can charge more for it because the perceived value is higher, plus you can make a little extra on the shipping charges too.

But if you spend money because someone told you this is "the only way you'll ever get this book published" (and you haven't researched any other ways), or buy advertising simply because it's where other books are advertised, or go to writer's conferences with no clear plan of what you want out of them, or pay agents "reader fees", or pay editors whose work you don't know or whose references you haven't checked, that's dumb money. You'll put those dollars out there and see little or no return