As a print-on-demand author – one person needs to ‘own’ the relationship with Amazon KDP or Ingram Spark. This includes giving them tax information, a bank account where royalties will go, and a charge card where author copies of the book will be paid for.
Because Print-on-Demand (POD) is a technological and internet based process, the Author or some one they are working with needs to have a good working ability to do things on line such as filling out forms and uploading files.
The two major POD printers are Amazon KDP and Ingram Spark. Both have similar, though not the same, requirements for interior and cover files. Both companies offer some online tools to allow creating of simple texts and cover designs using their tools.
Amazon KDP and Ingram Spark allow for e-book, or print-on-demand printed books, or both. The design requirements for printed books is quite different from e-books. To issue you book as both requires two separate sets of files. One designed for print and one designed for e-book.
People do judge a book by its cover. Professional cover designers can help improve the look of your book.