Hi! I’m starting a podcast myself and both are things I’ve thought about. I’ve found that when you talk about something your interested in, a more relaxed and confident side of your personality comes thus making you more personable. Also having a format/plan of what’s being talked about helps so you don’t get side tracked and ramble on. Also I’ve also decided I won’t be editing out my stutters from my podcast just because that’s me and if I’m sharing my voice that comes with it, which for me, was a confidence booster. Hope this helps! Good luck with everything