Check out the file formats that Autocad can export your drawing into and
compare this with the list of image file formats that Word can accept, i.e.
JPG, WMF, EMF etc.
Without knowing exactly the complexity of your drawing, the
quality/resolution will vary depending ont he export.
Remember that Word page setup is dictated by your default printer and also
has a built in page size limit (something about 22") that may also hamper
your exercise.
Trial and error will probably be the way.
All the best
DeanH