Using these great videos called "Signing Times", my girls & I work at learning sign language. It's wonderful. I remind them frequently that if they master it, they will be able to say that they are bilingual.
We are far from fluent, but do pretty well when we happen upon someone who is deaf.
I live in the UK and locally there are sign language classes in several locations (towns, cities mainly) throughout the UK. I was advised to join one and learn by my audiologist 12 months ago when I'd had my hearing re-tested (it had been getting a lot worse)and she said I should stsart while I can still hear reasonably well with my hearing aids. It is a really great way for anyone who is deaf to mkeet other people who are having the same xperiences and I guess for hearing people it can be a great way of getting an insight into what life is like for those of us who are deaf.
I went to a local college and learned sign language. It was a great experience and I recommend it as a learning tool. In person, you can ask questions, you get more interaction, and you can find the differing signs for differing regions! Several colleges offer sign language as an accredited course and some offer it as a continuing education course.
there are a lot of regional differences with those who use sign language. If you can befriend a member of the deaf community in your area, you will have a huge help to getting to know the local dialect.