Unfortunately, the self-publishing terrain has become a land mine of scammers. This is a good review of the basics. Please read and protect yourselves.
This piece from Just Publishing Advice distills some important basic considerations to attend to for those of us trying to learn the book-publishing and marketing process. I get “requests” to submit manuscripts quite often and have usually wondered who it is that’s so desperate to see my work when traditional agents turn down hundreds of submissions each week. This article helps to put the situation in perspective.