This is a topic that has interested me for years. While I am a writer, a published writer even, it isn't my full time job. I've found a couple of resources recently that have really been revealing and I thought I would share them.
Ditch Diggers is a podcast created and hosted by Mur Lafferty and Matt Wallace. I love Mur's work on I should be writing and her urban fantasy that I've read (Shambling Guide to New York City and Ghost Train to New Orleans). I don't know much about Matt's work, but I plan to look into it a bit.
There are only a handful of recordings so far, but Mur and Matt spend each episode talking about topics in and around the writing industry, and give a fairly blunt and open view of their careers as writers.
If you're looking for a 'how to write' or 'help me write' podcast, this ain't it. I would refer you to I should be writing and/or Writing Excuses for that. No, this is an honest look at what a couple of writers have experienced in their careers. This does have a content warning. Check it out!
Debut Author Lessons is a series of blog posts from Mary Robinette Kowal that she has written over the course of the last five years. She coves a wide range of topics that span a number of aspects of a new author's career, including travel, signing, contracts, agents, etc. It's an easy read and well worth the time. Check it out!