Selecting a topic. The topic you choose must be related to some aspect in the analysis of human language. The goal is to give you experience with real language data.
Human language is a huge topic, and choosing a topic probably feels overwhelming.
It is overwhelming. That's a sort of rough version of the scientific method. The questions you ask are hypotheses. The data you collect test a hypothesis. Go through your text books for ideas, both texts have bibliographies at the end of the chapters.