I'm attending the ACTEM 2013 conference in Augusta for the next two days. One of the hot topics when you filled out my tech skills survey was flipping your classrooms. My first session that I'm attending is about just that with Jessica Dunton from SeDoMoCha Elementary. She made up a great website with tons of resources, which you can find here. But one of the most important things she has stressed is needing to plan and start with easy stuff first. This worksheet, which is intended for you to use, will really help you think about the processes of flipping your content more.
I had a teacher ask me if there was a way to hide or remove students who are no longer in your class. The answer is maybe. It depends on if they are officially dropped from your class and appearing as red in your roster and gradebook. If not, then no, you cannot remove them until they have been unenrolled from the class. If the student is showing up as red in your gradebook though, you can hide them so you don't have to worry about them. Here is a screenshot to help you do it: