Questions about Wicca?

A friend of mine recently told me that her mother's friend is a witch, and told me all the stuff she told her about the religion. I became interested, and started doing some research, but i'm still confused on some things. I'm interested in becoming Wiccan, because I dont have a religion and it saddens me that I have nothing to believe in. But the concepts of Wicca amazes me and makes so much sense. I'm not sure exactly what it means to be a witch, which is why I want to learn as much as I can to see if it's really something I can live by. What is the "Divine"? And an altar? And most of all, what exactly does it mean to be Wiccan? What is the story behind it all?