For absolute beginner, you may want to seek out a more generalized instructional DVD. Check out Homespun. Even though it's for Southern Oldtime, Brad Leftwich's DVD assumes you're pretty much starting from scratch. You'll find many of the techniques, such as double stops and shuffles, cross over to a cajun style quite comfortably. I would suggest finding a fiddler that can get you started, hand positioning, tuning. Those are the kinds of things that are difficult to do with a DVD. You really need a voice to say "no, no, no', to get those things on the right track and avoid bad habits.
Steve