I recommend the AMOK system wholeheartedly and there are a number of other people out there that are really good. I really have liked those who kind of throw me in and then teach me the finer points while I'm actively fighting as much as possible. Most of what I can tell you to look for is more principle driven rather than avoid "this" and search for "that". Knives are simple enough that there's really not that much need to teach much about "pointy end or sharp side inserts first". Angles are good to learn, but if you spend hours practicing a complicated number system and patterns then you're building training "blindspots" that will come back and bite you. I'm out of time needing to go out the door now, but I'll try to add more later.
I do recommend however that every single LEO, Active Duty Mil, and person who may come into harms way go out and buy a couple of http://noktrainingknives.webs.com/apps/webstore/products/show/1618361
, put on protective eyewear and a mouthguard (maybe a cup too), and hand one of them to several aggressive mean friends and see what happens. Try it knife on knife, or their knife vs your empty hands. Pretend that it's a real knife as much as possible (don't get distracted by it being foam covered). React as you would if it were real. See if it's scary. Training with knives as with many other weapons usually is driven by a realistic view of what could happen if you don't. This is the best way I can show you that.