I have a publisher for my main books. So things like my book about Rory Storm and the Hurricanes will be printed by them.
I do these smaller books just for fun. They take my mind off research when I have had enough. They can be self published through amazon. KDP will make it a kindle book, all very easy to do. Createspace will allow books to be printed by order. But try a few publishers first, and good luck with your book.