Shooting portrait outdoor at night under stadium lights

Nellie

I am wanting to take pictures of the homecoming court at a football game at night. The stadium is very well lit. I have a Canon T3i with the lens kit and the 50mm f/1.8. I have been told that I can go out onto the field to take the pictures. Which lens should I use for on the field (up close) or off the field? How can I prevent the "halo" effect from the bright stadium lights? These will be individual shots and then a group shot of 6 to 8 people.

Thank you!