Well if it is a debate then there will always be some leeway based on what points are brought up. But you could use Monro's motivated sequence to base your structure a bit, depending on the length. I.
ATTENTION STEP: Get the attention or your audience. This can be done with a detailed story, shocking example, dramatic statistic, quote, etc. This is part or your introduction (in addition to stating your thesis, giving a preview of your main points, mentioning your credibility, and telling your audience why the topic is of concern to them).
II. NEED STEP: Show the problem exists, that it is a significant problem, and that it won't go away by itself. Document your statements with statistics, examples, etc.
III. SATISFACTION STEP: Offer solutions for the problem you have shown exists in the Need Step. These are solutions that the government or society as a whole can implement. You must satisfy the need.
IV. VISUALIZATION STEP: Tell us what will happen if we don't do something about the problem. Be graphic.
V. ACTION STEP: Offer alternatives to your audience that they can do personally to help solve the problem you have shown exists. Again, be very specific and very realistic.
VI. CONCLUSION: Motivate us to get out and do something! Wrap up loose ends by giving a review of points and restating your thesis, and then conclude the speech.