I'm pretty much self-taught due to my location (not many kayakers around where we live). I've found the Qajaq Rolls / Rolling with Sticks website fantastic! Lots of great videos of practically every Greenland roll and it's all free although I did buy the dvd and workbook. I also purchased This is the Roll dvd which is also great.
http://qajaqrolls.com/2013/12/getting-your-first-roll.html
Christopher is a great guy, mentor, roller and is always willing to answer any questions.
Good luck!
Tony
