This is a question you have to think about more yourself. Start by choosing an important event in your life that you clearly remember, it could be the birth of a sibling, the adoption of a pet, the death of a relative, or your first time experiencing something exciting.
Using the birth of a sibling for example-
I. Hearing the news
A. First found out
B. Preparation for them
C. Baby-proofing
II. Baby plans
A. Name suggestions
B. Gender decoration
C. Shopping for them
III. The baby's arrival
A. Hospital wait
B. How I felt
C. Meeting the brother/sister
This is just an example, you can do it off of anything you want, and expand upon any ideas to make the outline very detailed, or do the minimum required for one.
Hope this helps! :)