I am an experienced proofreader and editor. Without knowing more about your project, it is difficult to bid, but I charge $20 USD per hour. I can generally edit 8,000 to 10,000 words per day, depending upon the depth of editing required. I can edit for style, content, continuity, grammar, punctuation, spelling, and can verify research and citations. For fiction work, I also edit for story, character development, flow, pace, target audience and quality.
My most recent projects included editing a 4K-word non-fiction eBook in the history genre and an 85K word novel aimed at young adults who like history, science and adventure.
For an hourly project, I would need to see at least a sampling of the work and know the total word count to provide a good estimated bid. Then, upon acceptance, I would need 20% of the estimated bid to start the project. The final balance would be due me upon delivery of the product.
Check out my portfolio. I am an accomplished writer and all the samples are my original work, which I edited and proofread myself.