I am interested in obtaining my Spanish citizenship so that I may live and work in Spain, but am not sure who to contact to do this. My mother is a spanish citizen and I have obtained copies of her birth certificate & Spanish Passport and other paperwork I think may be needed to prove her citizenship. My father is American and I am currently a U.S. citizen. Can someone tell me what I would need to do this and who to contact? Is it possible to be a dual-citizen so that I could live and work in both countries if need be?

Thanks for any help!