Clock operator, scorekeeper duties...

[coachgbert]

I've been asked to be a scorekeeper/clock operator at a tournament this weekend. I've never done either. I need a quick lesson in things to look for to run the clock so I don't make a complete fool out of myself. I have never run a clock so I have no idea how to interact with ref from this perspective. It's a high school AAU tournament, 16 minutes halves, clock stops on all whistles is all I know. Is there anything else with starting time etc?

thanks,
Coach Gbert