Usually, proofreading comes after editing. If you feel confident in your editing skills, grammar and punctuation, then you probably just need proofreading. If you've already had your book edited, then you need proofreading.
If you are a new writer and don't feel confident in your book's overall grammar, then you need editing. If you are an experienced writer and have heard people tell you to get your book edited, then you probably need editing.
If you use my free five page edit, I'll tell you honestly which I think you need. I can usually tell from five pages. Don't be shy if you're not sure - drop an email.
