Couple of key things which I would expect,

• Speak clearly and slowly
• Do not rush through your points
• Be appreciative of your opposite teams and give them fair chance to debate
• Have fun!

I value organization and clarity--in speaking and in debating. Numbering your theses or points you are making helps me and the rest of the teams to understand your point. I know you have a lot to say, but make sure you are speaking at a conversational pace. If you speak very quickly, you might stumble over your words and thoughts, so be thoughtful about what you want to say and don't jam in every single possible argument.