getting started

A friend of mine loves Nerdist. I was intrigued. So I am listening to some Nerdist podcasts. My very first foray into podcasts. And I'm finding them very entertaining. (SOentertaining, you might say...) But this leads me to wonder...how does one decide that his/her conversation is worthy of other people listening to it? How does one get started doing podcasts? (This goes along with my question "how does one start ski jumping, etc.?") I guess it is somewhat like blogging. You just do it because you enjoy it and then if someone starts listening great.  

I discovered I really enjoy listening to people have conversations about random stuff. But I wonder how random is too random? Would I enjoy any conversation or is it dependent on something more? I will have to investigate...