One, if not the first, question I am asked is: "How much is it going to cost?"
Every project and budget is different, so I negotiate rates with each client depending on their requirements. Rates are generally based on the length and complexity of the text to be edited or proofread and the expected turnaround.
It is really useful to see a sample of the material you would like me to edit and/or proofread.
If you could forward such a sample (or even the whole text, if available) with your enquiry, it would speed up the assessment and quotation process and allow me to provide you with a quote that is as accurate as possible.