Facebook

I signed up for facebook a few months ago because I wanted to see a friend's kids. After that it just sat there. Well, a couple of days ago another friend asked my to let her on so I thought maybe I should go ahead an update things and try to be a active party. Today I went on and updated it a little. I am confused about what all a person can do on it. Do you write things? Do you email from it? How do you put on pictures? I understand the concept but I am a little computer illiterate. I know how to get into things I use for work, school and personal beyond that, not so much. I am excited about it. Hopefully over time I will learn to do more things on it.