The goal of a copy edit:

The aim of a copy edit is to clean up text and ensure accuracy of facts to provide your audience with a smoother reading experience.

A copy edit might be right for your material if you feel it needs help with:
  1. Correctness of grammar, punctuation, spelling.
  2. Accuracy of information, review of visual material, and tables.
  3. Consistency in editorial style, documenting sources, tables, visual elements, and spelling variants.
  4. Completeness of essential elements, including citations, permissions, and copyrights.

With a copy edit, standard marks are used to flag corrections using track changes or PDF. Some brief queries will be made as needed.  Final say on changes will always rest with you, and  I would be happy to guide you through this process. 

What a copy edit isn’t

A copy edit does not work to create more flow, improve language, or tone. This is a stylistic edit.

A copy edit also won’t include suggestions about dialogue, setting, structure or characters. If you think this is what you need, a manuscript appraisal might be a good place for you to start.