What is the "traditional" Siu Nim Tao? You can find a video of Yip Man doing SNT on youtube, but other, non-Yip Man lineages use a SNT with different emphasis, or order, or even movements. I think you'd be hard-pressed to define (and subsequently find) a "traditional" little idea form.
However, every variation of SNT should instill the core principles of Wing Chun -- centerline theory, low and heavy elbows, rooting and posture, and force generation from the elbows (not waist or shoulder). Consequently, you should be learning the first form from your teacher, and not from a video, who can correct your mistakes on the spot.
YM SNT http://www.youtube.com/watch?v=aX8-zb6n-48