Hello friend,
David has said 100 % right thing,if you are able to manage child then you can handle any business, because managing a child is really a difficult task.There is no particular way of handling them, because every child has different mental level so you have to work according to it. You can handle them by different ways.I think the first and foremost thing which we should follow is try to know their likings and dis likings and make them like every thing like whatever they don't like try to make them in favor of that, this will make them having a positive attitude towards every situation and they can face any difficult situation,and try to be friendly with them so that they can share their every problem with you.Try t spend more time with them but along with that give them space also.They should not feel very much protective and irritated with your interference.
So handling a child is same as handling a normal person.

Regards,
Nelson