To start a debate 2 section of people with different opinions should talk by supporting their opinion.
To end a debate both section of people should solve the debate and choose the best opinion.

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The topic given should be well perceived by the students & jot down as many points you get against or for the topic.
When you start the debate start with full confidence.
Try to defend yourself with good points so that the defending team are in a fix.
Towards the end try to be more challenging to the already fixed opponent.
End your debate by proving the topic for/against you & summarize the points again giving it a short summary about the whole topic.