To school! You will get lots of practice in high school and college. But if you want to write now, just pick a subject, and research it online. You should get plenty of ideas there. I could give a better answer if you had given more information.
A library.
school and other placess
Of course it is
use good grammar.
well i would write a poem like roses are red some diamonds are blue just to let you know i really like you!or something like that
ask another eleven year old.
Yes, an 11 year old is a child.
of course!
like whatever the 11 year old likes
The average 11 year old is 567893456
personality
No, because you are minors.
no as long as that 11 year old is responsible
it depends on how mature your 11 year old son is,