Analyze well-written essays. In your research you'll probably come across really well-written (and not so well-written) arguments about your topic. Do some analysis to see what makes them work.
What claims does the author make?
Why do they sound good? Is it the logic, the sources, the writing, the structure? Is it something else?
What evidence does the author present?
Why does the evidence sound credible? How does the author present facts, and what is his/her approach to telling a story with facts?
Is the logic sound or faulty, and why?
Why is the logic sound? Does the author back up his/her claims with examples that are easy to follow?