Try talking to some of the local restaurants like Chick-fil-a and Applebees. Both of those will do an "event night" where proceeds of the profits that night go to your group. Usually there is a flyer or container for receipts or people have to mention the event.
Skating rinks and other entertainment facilities sometimes will sell you discounted tickets that the kids sell at regular price, or a discount, and the group gets to keep the profit.
Start looking at the budget now with how much the group is going to need including meals. Plan on bringing pastries or donuts and juice for breakfasts to keep costs down. Make goals for the kids to achieve by a certain date to stay on track. Since the NoJ tickets don't get you in until 4pm, eat before going and bring snacks into the park to keep costs down. You might want to put the food budget on gift cards if the kids are going off on their own at all. That way you don't have to carry around a bunch of cash.
If you have multiday tickets, schedule some activities like checking out other resorts, pool time, scavenger hunts, or something to prevent squirrely teens. I remember a few years back someone wanted to do a scavenger hunt where the teens had to go around to different places that didn't require a ticket and figure out where certain pictures were taken. Another good challenge is to collect Transportation cards which can be obtained from random bus drivers, monorail attendants, and boat drivers and helpers.