If you just want to learn spells so you can go out and put a curse on someone, forget about Wicca. We have enough bad press as it is. Secondly, Witches believe in the three-fold law, which is a good thing to remember if you ever think about doing magick to harm someone. The law says that whatever energy, whether positive or negative, that is sent out returns threefold to the sender. I feel that the Law spans lifetimes, so that if you do something bad in one life, and you never received your three-fold payment, you'd better look out in your next life.
Witchcraft is recognized in the United States as a legitimate religion.
Also, check out The U.S. Armed Forces Chaplain's Handbook section on Wicca. Magick and spell-working is an important part of Witchcraft. Rituals are performed at all times, the most popular are the New and Full Moons, and at eight Sabbat festivals which mark the Wheel of the Year and the changing of the seasons. One can work magick or do ritual every day if one wishes. Rituals are performed within groups, called covens, or by individuals, called solitaries.