I create the notes in Word making sure to define necessary vocabulary, include important formulas, and provide examples to work out for students as well as practice problems for them to try. I use a lot of tables and hide the borders to create the formatting. I have the luxury of having ActivInspire sotware (used with Promethean boards) which I can use to take snapshots of anything on my computer screen. We also have our textbook online so if there is ever a diagram or graph that I want to include in students' notes (and later in the video) then I can snapshot it into the Word document. You can also do this using a program similar to Snagit from TechSmith.
Once I have the Guided Notes complete I snapshot them into a flipchart to be the basis for my videos. You can begin laying the groundwork for flipping your classroom by creating Guided Notes for your current classroom. These can be great aides for your traditionally run classroom and they will also be the foundation for your videos when you begin flipping.