Yes, they do work if you do them right. However you firstly need to learn the basics such as meditation, grounding, centering, shielding, energy work & visualisation. There are also other things that would be useful such as magickal correspondents to help empower a spell. If you're beginning and looking for some good books, Scott Cunningham is the man. He has a lot of good books regarding witchcraft/wicca and Raymond Buckland & Christopher Penzcak are also excellent.