This is an article which was written by professionals therefore this would be a good source in order for us to use when creating our trailer so I had discussed and showed this article to my group members  

http://www.chrisjonesblog.com/2012/02/how-to-edit-a-trailer-for-your-movie%E2%80%A6-but-the-guy-who-cuts-trailers-for-movies.html

This part of this article particularly struck me as I have been consumed lately with trailers and the most effective trailers are the ones that only provide a sneak peak which would lead me to find out more and end up watching the whole film

http://filmmakermagazine.com/37093-first-impressions/#.UytdJvl_uSp