Based on what you know. . .
- What is your controversy? (Think of this as a question one can answer with Yes or No.
- What is your thesis? (This is your answer.)
- What supporting reasons can you think of?
- What opposing reasons come to mind?
- How would you rebut or refute (undermine or overwhelm) these opposing reasons?
This will prepare your mind to search for and evaluate sources. As you find better reasons, or sources that back up your reasons, you can update this mind map.