It is important to know who your audience will be, so that you can adapt the content and style of your presentation to the requirements and needs of your audience.
You can start by asking yourself some questions like the ones below to help you focus on your task:
Is the audience well-informed about the topic?
Will I have to provide background information?
Do I have to argue in favour or against an issue?
What will be the main point in my presentation?
Which conclusions can be drawn?