Basics of the Wooly Worm are simple,
Use a #6 2x long nymph or even a streamer hook if you like.
Tie in a hackle(tip first) at the rear of the hook,
Tie chennille in at the rear of hook and wrap forward to within 2 head lengths behind the eye, tie off,
Wrap the hackle forward in somewhat open wraps to where the chennille is tied off.
Build up a nice head and your done with a very basic W.W.
You can add a tail, some weight or even a wire rib to protect the hackle if you want.
Use any color combinations on the body, hackle, and tail.
This should get you started in the right direction.