The NBA and Middle School are two different levels of shooting - the game is 10,000x faster and many clients want to see higher competition stuff to know you can capture the speed of the game and the big differences in how the game is played. With that said, many don't as well. I know one guy who got a "gig" just by showing little league stuff and then was shooting pro ball (not for the team, paper - but still).
A 40D isn't fast enough (sorry, but working with card companies they are VERY high on equipment because they want to know you won't miss a shot). But wait a minute, if it's an indoor sport you may be using strobes and that's not 10fps either.
If you haven't noticed I'm contradicting myself as there's no perfect answer The simple thought process is be ready to asnwer anything they can throw at you about sideline behavior, about using lights, about the game itself, about yourself as a person, about equipment, etc. If I'm the team photog and looking for help I'd be there in the interview as well and ask some random questions out of what seems like nowhere just to test your knowledge base out of the blue.
As for shooting a practice I would not count on that, most coaches at that level do not want media in the room - there's that "special" time media can come in and shoot but usually its a no.