I blogged the technical side of that today on that topic over at: https://blog.findawayvoices.com/what-ive-learned-from-recording-25-of-my-own-audiobooks/
BTW, did you know that I have 25 audiobooks and I’m adding more all the time? https://www.mlbuchman.com/audio/
SUPER TIP: Best prices are at Kobo, Nook, and Google Play. (All that I control the price of are under $10, even the big novels.)