I would suggest imagining you are meeting a stranger one-on-one for the first time (example: a classmate) and just introduce yourself. Talk about yourself, your family, interests, hobbies, likes, dislikes, in a natural manner. What would connect you to your audience? If these are classmates, then talk about school-related activities, clubs, music that you are a part of. Do you have an opinion on US foreign policy or global warming? Talk about that, too.