The links below are all content that you will have access to post-graduation. They are great generalized business resources which can provide you with career advice and guidance.
However, another resource to consider is a professional organization in your field. For example, the American Libraries Association offers online mentorship, career advice, and an entire office of Development and Recruitment.
You have been asked to choose a topic relevant to professional communication and choose either a video (e.g., YouTube, TED Talk) or article.
In order to lead a successful discussion on your topic, you may want to examine the Library's business and general databases. While you won't have access to all of this content after graduation, publishers often make some articles available for free.