How will you mark your edits?
This depends on what you prefer. Most of my clients prefer me to edit with tracked changes so that all they have to do is accept or reject each change. Others prefer that I only make suggestions via comments in the margin; they either want greater control over the edits or wish to learn from my suggestions so they can refine their writing craft. Be aware that editing with comments instead of tracked changes does take longer, so it will cost more.
I plan to create tutorials for clients who need help reviewing and working with tracked changes. Until then, please don’t hesitate to ask me for help.