where to post the Book I'm Writing

So recently I've started working on a book, I've had the idea for a while now and I've been writing professionally for years. But this will be the first work I submit to the podcast, it blends body horror, psychological horror, cosmic horror, religious themes etc I want to know where to submit and how this is a creepcast original. How should I go about it should I publish in chapters or post all of it at once, it's almost done and it will be physically published as well with hard and papper back covers thank you.