Duolingo

Learning from another person one on one is probably the best, but that obviously takes a bit more money unless you have a friend who can teach you. You can always take classes too, depending on what's offered where you live. Other than that I'm not familiar with any specifics, but I know there are lots of books you can get to learn from, and probably a number of games also designed for the purpose. Just search around and there's lots to find.