Acknowledge other debts as well. The general rule is that whatever is not a product of your own brain should be acknowledged. Since all of us know what has been said during the lectures, we can assume it is common knowledge and need not be cited. When responding to objections raised in the discussion, you need to use your own judgment in balancing the need to acknowledge debts and readability. Acknowledge particularly pithy points, and don't steal ideas.
Quotes can be helpful, but keep quotation to a minimum.
The paper should be by and large in your own words. Read over your paper after you have written it. Make sure you addressed the topic and made good of your initial promises. Rewrite any parts which might be difficult to understand. We can read your words, not your mind.