"witch" is just a label really, no one can make you one. [granted it was believed only a witch can initiate a new witch] read and study because a witch typically is someone who is always pursuing knowledge. you can cast spells, but it's not something exclusive to witches. read the basics on magick and the holidays, but since i don't know what path you're interested in, i can't suggest books, but try books by Raymond Buckland or Scott Cunningham.
that website has more information for Wicca, but it has a lot of information on other paths as well, so it should be of some help.
First thing in any sort of witchycraft or things involving magick you must do meditation because that is the root to the plants of magick, also check this link out to help you in witchcraft or to help you become a witch amd also to help you understand it really well these are little clips about it
Also let me know if you have any other question or would like any sort of help.