You need to see yourself as a self-employed business person whether you self-publish or go through a traditional publisher. The publishing industry is terrible about marketing books and always has been. Publishers/Editors don’t know why books don’t do well.
Push with the same attitude whether using a publisher or self publishing.
Publishers expect you to come in with a platform: email list, Facebook fans, etc.,
Don’t expect much editing help from a publisher.
Advice from David Morgan. Richmond Writer’s Group. April 20, 2013