You are incharge of your own icecream stall what you have to do is watch what the kids are after and pick those items up put them on a try and pass them over to the kids. make sure you make the correct orders other wise the kids will not accept them. and you will have to dump it in the bin and start again.
each kid will stand there for a limit of time make sure you serve them quick and collect the money they leave behind. If your unable to serve them in time the kids will walk away.