Have you got Microsoft Word and, if so, which version?
Have you already got your labels? If so, which make and code (or what are the dimensions?).
If you've not got the labels, do you know the size you'll require?
Printing an 'all different' sheet of labels in Word is simple enough but the exact instructions differ between the various versions. They also require you to tell your computer the type of labels you're using either something like 'Avery L7160' or the exact dimensions of the labels.