Re: Debating Techniques, styles and such.
Etruscia
Speak very loud, and with passion (as if you believe what you are saying). Here and there say something that you know people would like to hear (even if it has nothing to do with your speach).
And invite some friends of yours to support you with noisily manifestations.
In your speach try to suggest- not too obviously - that those who disagree with your ideas are ... (all that your public most detests).
I don't know if this method results all the time. But with Hitler it did.
But never, never try to be ironical, at the cost of your public. People hate that. Socrates did it, and see the result.
Good luck.