Vampirism
The first thing you will want to is find a vampire. You can find one in a cave by morthal, if you are unable to find it then go to the burned house in the same town. Walk through the door then walk to the Jarls housein the same town. Talk to the Jarl and ask her about the burned house, she will tell you what people think happened and then she will ask you to solve the crime. Go back to the burned house and look to the left once ou walk in the door, you wil see a ghost of the little girl that got killed in the fire. She will ask you to play hide and seek with her if you want some answers. You have to wait till it's night time then go to the grave yard, the grave yard is north of the burned house not very far, if you can not find it talk to the Jarl and she will tell you were it is. Once you get there there will be a vampire waiting for you, do not kill her right away let her use that red magic stuff she is casting on you. Once every minute or so go to your magic and go on active affects, look for the disease of vampirism, it should be written in red. Once you do you can kill the vampire. You can finish the quest to battle stronger vampires or you can leave. Once you have the disease it will take three days for you to turn into a vampire. Try to feed on people every night so people won't know your a vampire. You can feed by sneeking up on people while there sleeping, be sure to be in sneek mode or they will see you feeding on them and try to kill you.