Podcasting?

So my darling husband has convinced me I need to start podcasting. I tend to come across articles and such and tend to rant/discuss them with him, or rather at him, so perhaps that's his motivation for the suggestion. At any rate I'm going to do it, but I'm a bit nervous. I mean what if I sound dorky? I know you don't hear yourself the same way others do but I'm a little nervous, I don't think I sound that great on the answering machine, is that any indication of how I'll sound on the computer? haha
So I suppose my first cast should be about me, what I stand for and what the casts will be about, which I imagine will be primarily pregnancy, birth, babies, breastfeeding, being a student midwife and occasionally the crazy life I lead as a homeschooling mother of 6. But after that??? hmm... must figure out something... and a schedule! How frequently should I do this? Do I need a schedule? Would people be more inclined to listen if it was a regular program?