Start with high-confidence podcasting & webcasts books, then narrow by subgenre or adjacent topics.
So You Want to Start a Podcast
Kristen Meinzer
The Power of Podcasting
Siobhàn McHugh, Siobhaan McHugh
Youtube Channels for Dummies
Rob Ciampa, Matt Ciampa
Market Domination for Podcasting
Seth Greene
NPR's Podcast Start Up Guide
Glen Weldon