10 POINTS FOR BEST ANSWER. sign language question?

So I am 17 years old and I am interested in learning sign language. I'd do anything to learn it but I am looking for a program that is either free or a small fee. I want to get someone to teach me how to speak sign language. How do I do that? Also is it possible for me to find someone who's my age who speaks sign language who can help me?? Any suggustions on what I should do. Because when I'm older I would love to adopt kids who are deaf. <3 Please any suggustions would be nice thanks :)