You can do everything together, or divide the labor. Everyone should put in the same amount of effort, even if you are doing different tasks. Each group must turn in one write-up that briefly describes the topic, the presentation, and the research you did to prepare for the presentation. The presentations themselves can consist of any materials you want. Collages, videos, interpretive dances, and skits are all acceptable, as is lecturing.
Handouts are okay, too.
You will have 15 minutes of class time to do your presentation. While this may seem endless at first, you will soon discover that you have a lot to say. Regardless, you will only have 15 minutes of time in which to say it all. Group grading can sometimes be problematic, because one member may be working harder than others. Please try to sort these issues out as a group over the course of the semester.