I tried it myself, and it turns out that the parts of the Roman Oration are sort've hard to find. What you have found will work perfectly, but this is what I was referring to.
I. Exordium--introduction to arouse interest II. Narratio--statement of the facts III. Propositio--statement of what is to be proved IV. Argumentatio 1. Confirmatio--affirmative arguments 2. Confutatio--refutation of opposing arguments V. Peroratio--conclusion
Good luck arguing!