Which theories and historical influences should most impact the school's we'd like to have

It isn't much of a historical influence since it's so new but I guess it kind of fits the theories aspect; expeditional learning. From everything I have learned about it in this class I would love to see it in action once and possbily integrate it into public schools if it really works as well as people say. From all the research I did on my educational shift and the Colubine shooting along with the Virgina Tech one I certainly believe that those two events should never be far from our minds and they should be there to remind us that it could happen at anytime anywhere. Court cases like the scopes monkey trial and Brown v. Board of education should remind us that things are constantly changing and we need to be read when it comes. Teachers need to be some of the most flexible people out there because our profession is constantly evolving, the more we learn as a society the more we have to pick what to teach and what not to, it's tough. My question would be how do pick and choose what to teach and what to skip over because the scope of what I could teach a class is so broad, how do I go about that?