Shana Gorian has some good advice about self-publishing.
My bit of advise – to find a good editor, try the Editorial Freelance Association – EFA – at the-efa.org. To find a good cover designer, try asking a linkedin group for illustrators or graphic designer. You can also ask other authors who’s books you like. They know what it’s like trying to find someone to trust. You can also contact me. I’ve got contacts in many areas of the process that are very reputable.