When you are writing a post there is a picture tool right next to the spell check. Just select your pics. and upload.
on facebook nobody can see your profile that you dont confirm as a friend. Somebody could look up your name, but that is all they would initially see of you, (and a photo if you put on in your profle). They send a request and you have to confirm that you want to add them to your friends. So, just dont let any kids on.
Jenn gave me good advice, when you are on there posting on walls, everybody who read what you write unless you do a private posting, so watch what you write on the public walls.