Ask yourself why you even felt you had to do research at the particular level. What inspired you? What is your passion? Write whatever comes to mind.
Think about your research approach. What are possible research topics? What research methods would possible topics suggest?
Reflect on what you have written before continuing. Consider the implications of your thinking. Note recurring patterns/themes. Find articles that explore your thinking, ideas and feelings.
Note different resources you think about or have discovered. Make notes on studies you have read: Write the research topic, findings, ideas for further research, your main impressions and location of articles.
Note significant and relevant learning during coursework. Write weekly summaries and reflections. Note unanswered questions and sources for possible answers.
Note milestones of research proposal/implementation. Note challenges and your thoughts about how you coped. This journal becomes a record of this particular research experience.