@Look, you have to do 3 reflections total. The word count for the three of them is 500 words, this means that the total amount of words that the three can add up to is 500. My recommendation for writing your first reflection is that you just talk about your journey through picking a topic, subject, etc and how that has helped you improve your process. Don't stick to desciption texts, analize how everything that you said helped you get to where you are now.
That's all my tips