How to pitch yourself as a guest on a podcast: http://michellelevans.com/pitch-podcast-guest-like-pro/
Blue Yeti Microphone (the bomb!): https://www.amazon.com/Blue-Yeti-USB-Microphone-Vintage/dp/B01H3DXTG8/
Summary:
I love podcasts. : )
Highly recommend podcasting (on your own or as a guest) if you have an audiobook. It will work for all formats, but audiobook especially.
Can be expensive to run yourself (estimated $2k/month if you outsource), so test the waters as a guest on other podcasts first.
Very immersive & excellent way to connect with audience on a more intimate level.
Focus on finding podcasts who are already talking with your niche market.
For an excellent podcast – the most famous one – check out Serial Season 1. You may get hooked.
To find podcasts in your niche, use iTunes, Pocket Casts, and/or audioBoom.