You won't be able to learn knife fighting without a training partner. It is true that without a partner you can learn to draw your knife fast and thrust or slash, but not how to fight. Unless you are planning on a surprise attack against an opponent that thinks you are unarmed, the draw and thrust will be pretty much worthless. You need to learn how to mix it up with a man slashing and thrusting his own knife at you. That requires drills, drills and more drills. Find a buddy, go to a seminar and then the two of you train with a tape. Or maybe tell your Kenpo instructor that you are interested in knife fighting skills, and see if he will help you out.