Friend me.

My husband grew up in Michigan. So this weekend he stepped unto the vast unknown of Facebook to find some of his friends. He have found some of his friends. Thru some talking about it and I guess a little courisity, I decided to check it out and see what it is all about. Well I started up an account and so far so good I guess. I can tell my age because I really do not know exactly what I am suppose to do at all. Now I am getting request to be peoples friend. These are people that I know of so I do not have a problem being friends. The problem is, I do not know exactly what am I suppose to do with this. Do I communicate with this friend on a normal basis?