I'm not really sure on this one I would suggest researching them and if you specifically want to become a vampire I would say write your own spell that contained some drinking of some sort of blood. But if you just want to be magical think of something easier to become like maybe a mermaid/man and you can also write a spell for that to good luck x
Why would you want to do something demonic like be a vampire? The Twilight movies are fiction..... You can't be a teeny bopper vampire. Jesus is the only way to have eternal life.