Before you approach an agent, or a publisher, and definitely before you self-publish, you need an editor. A good one. And before you approach an editor, you need to make your manuscript as clear, consistent, and clean as you possibly can.
This course walks you through the process of getting your manuscript as polished as possible before approaching an editor—because they are busy, too, and will not usually take on a project that needs too much work.
The course is also a professional sample edit with a lot of feedback. Lessons discuss how to find an editor, how to interact with one, and how to take the plunge of hiring one.