Currently, Mastering Book Publishing only focuses on publishing a Kindle and Paperback book on Amazon's Kindle Direct Publishing (KDP) platform.
If you haven't yet published a book and are a beginner, it's recommended you start with a Kindle and Paperback book, which is a lot easier. Audiobooks is a more complicated and advanced process.
If you want to learn more about publishing an audiobook on Amazon, then check out Mastering Book Marketing, which goes into strategies on publishing and marketing an audiobook.