sounds good
however;- would you have to pay someone to look after your kids while you did and if so would it be worthwhile
and how much do you think you would charge and how much would be over heads (equipment, petrol, etc) and how much profit
and do you live in an area densely populated enough to get plenty of business as you wouldn't be getting much repeat business and if so are you sure there isn't anyone else in your area offering hte same service.
and what would you be doing with the kids while they wait for the items to bake and cool? I think the party hosts would be wanting you to do something to entertain them while they wait
just off hte top of my head, but good luck