Holding Down the Fort

I've been holding the fort for this new teacher for a week, but I've gotten no help. When I accepted this assignment, there was no lesson plan, and no technology plan for the computers. No one told me that I would be substituting for the yearbook advisor. I never did anything with the yearbook when I was in school. How am I supposed to know what to do with the yearbook staff? Many of the students take advantage and disrupt the class by toying with the computers and making as much noise as possible. How could this school allow this kids to get into the yearbook staff?