Leading up to research, give students lots of experience with nonfiction similar to that which you expect.
Try text inquiry—What do you notice? Maybe paired with “What makes a good report on_____” chart
Point out features you may be focusing on, like a grabbing beginning/strong lead, and later do an activity like a book pass to help students identify multiple examples of how this strategy is using in nonfiction text.
From Tony Stead's Is That a Fact? Teaching Nonfiction Writing K-3 1. Select your writing purpose, audience, and form--you may frame this as a genre piece (eg feature magazine article). 2. Immerse writers in a content area to create a real context for the learning of the selected writing purpose and form. 3. Assess each writer's skills and understanding in writing in the specific form selected. 4. Whole class exploration of the selected topic/text by student writers with teacher: A. What makes a good_______piece? B. How do you write a______ piece? 5. Independent/Guided Exploration 6. Follow-up assessment to determine each student writer's skills and understanding in writing of the specific form selected. 7. Contemplate future considerations for teaching and learning. A Framework For Teaching Informational Writing