Welcome to Spells of Magic, okay, I would like to bring to your attention so that you are not confused in the future, vampires are not real, educating yourself in vampiric lore is not really educating. Also, "Witches" is a label, not everyone goes by the label "Witch". Meditation is a great for of centering ones self, it teaches patience and concentration. Magic is in everyone's blood, anyone can do magic, they do it everyday, some knowing it, some not knowing it. Now, I hope you know Witchcraft itself isn't a religion, it's a practice.
Whether or not someone has a mark on their body doesn't define them as a "Witch", again not everyone labels themselves as a "Witch". Whether or not you have a mark on your body doesn't define whether or not someone has the ability to practice the spiritual arts.
I would recommend some of these readings from the site, these should help you on the right path;
http://www.spellsofmagic.com/read_post.html?post=483942 (The Basics: Expaned) By: AwakeTooLong
http://www.spellsofmagic.com/read_post.html?post=71692 (Starting Out) By: Starrie
http://www.spellsofmagic.com/coven_ritual.html?ritual=795&coven=245 (Reference: Moon Phases) by: Raven's Gate "Coven"
http://www.spellsofmagic.com/read_post.html?post=526472 (Visualization) by: Lark
Please read these, these should help you on your way to learning about magic, Lark also know's quite a few useful books to help you, the major points you should know about is, trust your gut, if it feels to good to be true, it probably is. Don't always believe what you read, magic can't alter the physical plane.