Yooo should've hit me up man! I did this for a few months in grade 12, only physical disabilities though.
If there are other instructors around try to get as much info about the disabilities the kids have and how they work, sometimes you're going to have to get them all doing different things to acheive the same result. Really depends on what you're working with. Try to think about what result you want (ie, more forward pressure, keeping their eyes up, balance stuff), and then try to think about how you can work with their disability to get the result.
You'll probably have kids with CP (cerebral palsy), and maybe a couple amputees. When I was doing this instructing I had like 4 kids with CP. The sit-skiers and blind guys will be working with other people with more experience most likely.
Also keep in mind that kids with CP can have a lot of different levels of impairment, some have almost a full range of motion and some severely reduced. As a result of this though, stuff like running and skating and jumping can be much more difficult for them, and they might tire out more quickly because they have to do a lot more work to move certain parts of their body.
hope that helped, it was a few years ago though and I only did it for a couple months.
Super rewarding experience fo sho, I know a couple of the kids I coach are still skiing, one is racing on the Alberta team and another goes out like every weekend. Have fun man! It'll blow your mind haha.
Who are you working with, CADS?