What should i charge people for me to film and edit a video for them?

One of my parents friends asked me to film one of there childrens sports games and to edit it. She said that she would pay me to do it and that if i madde multiple copies of it she would sale it to some of the parents and grandparents of the kids that are on the sports team. But i really dont know what to charge for either . help would be greatly apreciated.