Howdy,
You won't have to skate like the wind to be able to help them on the ice, but you will need to at least get from one place to another in a reasonable amount of time. If you can get from one place to another, push goals around, gather up pucks, move cones/tires, etc... That would likely be a help on ice. Only way you'll know is if you talk to the coaches and see what they say.
If you can't really skate, then I echo the off ice aspects... Helping out as a scorer, on the bench running a door, organizing referees, working with your local rink, doing tax forms, etc. etc. There's a lot of things going on you should be able to pitch in with.
Oh! And yes, there are indeed crash courses at most rinks in terms of beginner skating classes for adults. So don't rule out just "learning to skate". There's often beginner hockey classes and even leagues as well. Be a little careful though... That was how I started and now I play beer league 3 nights a week and ref 2 or 3 more. 🙂
Mark