This is a good basic primer on how to use Word more efficiently.
Using revision tracking in Word.
What to do with an edited Word file (from a fellow editor).
Finally, how Track Changes works.
While I am more than happy to do the scut work of, for example, hand-converting simple typed footnotes into Word's linked, auto-numbering notes, or creating a document structure using styles to create a table of contents, having those basic things in place means I spend more time on your glorious prose!