FACEBOOK DataBase analysis?

See more:

PHP

MySQL

hi masters,
excuse me because of the language,
i want to create a social network web service for schools & kindergartens like facebook, now i want to help me how do i begin to create database in mysql(analysis).
users can share posts, images, comments, likes and etc just like facebook moreover i have to define the ability of parental controls(e.x deleting the posts,comments) for parents.
i would estimate that the number of users will be <= a thousand.
could you please help me how should i begin.

best wishes & dreams.