Please don’t start a podcast because you think you’re supposed to start one.
I’m guessing (and hoping) that if you took the time to read this long-ass tutorial, you already have a theme in mind for your podcast. Please don’t start a podcast because you think you’re supposed to start one. Start one because you WANT to start one. That in mind, talk about things that you care about, things that are fun for you, and things that YOU actually want to talk about. Podcasts are fun, but they are still work, and take a good amount of time to create. As such, if you’re not truly interested in what you’re creating, you’ll never stick with it. Everyone starts a podcast, very few people actually keep them going.