I don't know of any specific cues given with spurs. I wear them all the time and only use them very lightly to cue (as they are often more precise than a blunt heel) or if I feel the horse needs a bit of extra "encouragement" to back off my leg, but I don't train my horse to do anything with spurs that I wouldn't expect him to at least eventually be able to do without.
Why are you thinking of using spurs? Are you going to a higher level of training with your horse? Do you feel you need some reinforcement? How responsive if your horse to leg cues without spurs? Answering these questions might help us help you better!