I could only help you get ideas for this, because every ones "first" is different. So: first, remember a recall of you doing something for the first time that you remember first. For example, learning to ride a bike, or fist day of school. Then describe how you felt in that situation. Were you excited? Sad? Angry? Happy? Impressed? Then, describe why you feel that way. After that, you can also describe what happened before that, and how it links to the first time of something. You may also include small details like who was also there with you and how did THEY feel for you. Good luck. But what I wrote might not help. If it doesn't, you could ask your friends or your family.
