Since vampires are barely introduced in the Harry Potter series, you have basically free reign. I agree with what people are saying about J.K. Rowling sticking to mythology a lot in her books, but you can probably add your own little twists. All I have to say is stick with what the books say and don't blindly follow any other book or myth. Make your story original!
A vampire was introduced once in the 6th book at one of Slughorn's parties. Although the vampire wasn't on some rampage for blood, he didn't seem unwilling to attack people. Maybe that was because he was more used to human contact, I don't know. Most of this is up to you to decide.
Hope this helped somewhat.