This isn't necessarily going to make you win, but it will help you... some tips:
1) Be prepared for hard questions- if you are not prepared, you might feel embarrassed if people ask you about something you don't know about or if you can't think on the spot of a good answer. It may help to think to yourself: 'What hard questions would I ask?' and you might come up with questions you can prepare yourself for.
2) You are ALWAYS right, and everyone else who doesn't believe what you say is WRONG- whatever happens, BELIEVE what you say and always remember- YOU ARE RIGHT AND THE OTHER TEAM IS WRONG!!
3) Insulting doesn't help- if you personally insult the opposite team, it is not a good sign.
4) Come back to a central argument- if you always refer to one central argument (although not REPEATING the argument too much), you look more prepared and you'll look as if you know what you are talking about (hopefully this is actually the case!!)
If you are still stuck, follow this link for some more tips:
http://ezinearticles.com/?How-to-Debate---Tips-and-Tricks&id=163559
Barbazan-Debat's population is 3,462.
The population of Cazaux-Debat is 12.
The population of Bernac-Debat is 557.
Chelle-Debat's population is 211.
Oléac-Debat's population is 105.
Alexis Debat was born in 1972.
Bernadets-Debat's population is 108.
The area of Barbazan-Debat is 9,780,000.0 square meters.
The area of Cazaux-Debat is 1,480,000.0 square meters.
Édouard Debat-Ponsan died in 1913.
The area of Bernac-Debat is 3,900,000.0 square meters.
The area of Chelle-Debat is 8,690,000.0 square meters.