There are a thousand reasons why working with a publisher is going to benefit you versus self-publishing.
I am presently working on a book for submission to Mystic Publishers and I've found out they are looking for new talent. If you've wanted to work with a publisher and the editing, cover work, circulation that you desire, then I'd suggest you give Mystic Publishers, INC a look-see. LINK
They also offer services for those who want to self publish, from editing to cover art and formatting for upload. LINK
I highly suggest you pursue this publishing company as they are very actively involved with their writers and help you along the entire process.