A.H.
I started signing to my son around 10 months (that is the age that the baby signing books say is good), but he was completely uninterested. I picked it up again when he was 14 months and he caught on fast. So you're at a perfect age really. I just got some baby signing dvd's and a sign language dictionary (a full dictionary so that I could look up words as needed).
Sign language was a life-saver for us, and I'm really glad I did it. My son didn't start talking until he was 2.5, but by that time he knew nearly 100 signs. It allowed him to communicate with me and saved a lot of frustration. As soon as he learned to say the word he stopped using the sign. He's 3 now and no longer uses any of the signs. I really recommend it, it really helps a young child to get their point across. Good luck with it!