Amazon KDP, formerly called Createspace, is the self-publishing arm Amazon has created for book print on demand. Most self-publishing authors use Amazon KDP because of its ease of use and the cost to print self-published books.
I've always found checklists handy, and this one for self-publishing is no exception. If you think I've left something out, let me know so I can add it. Feel free to print this and share with my business name on it. Most important (and do this before you pay anyone to do any work on your book or you'll waste a lot of money)