Ghostwriting can involve various levels of effort, from working from the client’s notes to doing the research for the client. When considering working with a ghostwriter, you’ll want to have a good grasp of your project and how much you expect of the ghostwriter versus how much you are contributing to the book yourself.
Proofreading is the last step you need in the process before you submit your manuscript to an agent or publisher or before you send your galley to the printer. Proofreading involves looking for errors. It does not involve editing—that should all be done before you get to the proofreading stage.