It's repreesenting an argument in a friendly way; You would typically debate in order to prove or defend an idea. It isn't that complicated, really, it's just forming a case in the first place that proves a challenge.
Okay, might as well type this out, I don't really understand in what way the argument is constructed, or how much information I need, or anything really.
Debates are structed arguments. It is a give and take: a point, a counterpoint, a rebuttle, etc. But how they set it up in your school may differ. Some debates are just making points, others work off of one, others use factual based ideas, others use opinions.