If laptops are available for each student, use them. In class, have them do the first part of the paper, writing about what they already know. Work with each student and final draft this part. This will give students a chance to see how the tone of the paper should look. It also gives them a sense of accomplishment to finish the first part.
The second part can be another class period. Again, final draft this section. Help them word their questions effectively.
Once the first parts of the paper are complete, it's time to do lessons on collecting information and the interviewing process. You may want the interviews to be separate parts of the paper, but included in the third section.
Decide how you want them to cite their information. Even though most of their material will be primary sources, they still must use appropriate citation methods. They may also use the internet, magazines, brochures, and some books. Because of the variety of material, consider doing some lessons on using the MLA format.
Start each day with a mini-lesson on a particular skill needed for their work. Consider reading a part of an I-Search Paper. This will set the tone for work and keep the ideas fresh in their mind as they begin to work.