As you determine what final product you will have your student researchers complete, you may want to have them write their paper in a format to be submitted to a journal accepts papers from high school students. If you know from the beginning this is one of your goals, I would teach the documentation style of the specific to which students will be submitting. Having peer-edited (by scientists, not high school peers) journals is a wonderful way to provide your students with an authentic audience. As I learn about these, I will post them here on this page. As of now, I know of two. The Journal of Emerging Investigators (JEI), and Journal of Experimental Secondary Science (JESS). Below I've copied and pasted the website descriptions below, with my comments following.
The Journal of Emerging Investigators
"The Journal of Emerging Investigators is an open-access journal that publishes original research written by middle and high school students in biological and physical science. JEI provides students, under the guidance of a teacher or advisor, the opportunity to submit and gain feedback on original research and to publish their findings in a peer-reviewed scientific journal. Because grade-school students often lack access to formal research institutions, we expect that the work submitted by students may come from classroom-based projects, science fair projects, or other forms of mentor-supervised research.