Amazon book distribution means the title can be sold on Amazon (Kindle and/or paperback via KDP). That is not the same as being orderable by Barnes & Noble, independents, or libraries.
Amazon only (KDP)
Fastest path if Amazon is the whole plan. You upload files, they list the book. Guide: how to publish on KDP and how to get your book on Amazon.
Wide / wholesale (Ingram-class)
A POD/wholesale record other retailers can order. Bookstores still decide whether to stock it. See IngramSpark vs KDP and bookstore orderability.
What AuthorShelf packages include
Global retail / POD setup is part of production so you are not inventing two dashboards from scratch. Bookstore returns are included on Pro+ (add-on below). We do not promise Amazon bestsellers or forced shelf placement. You keep 100% of net royalties from those channels.