I would start with gathering info of actual news casts (if this is your plan), or just get the basic jobs that're blatantly obvious (if there isn't enough people and/or previous statement isn't your plan) and make an application form.
If this is gonna be an actual thing, you should bring in competent people! Though since this could (and seems quite possibly going to) be something silly, I could see the guidelines being a bit relaxed. (That's your call, however!)
As for the actual content, it really depends on your style, and what is being over viewed, if there is an actual server report going on, actual server footage can be attained and possibly PiP'd on the screen, much like an actual newscast. You could even bring in a reporter in certain cases.
I'm so sorry, it's just I'm used to posting on off topic.
Not saying it was a bad thing, plus I could understand your reasons for putting it here. Heh