If you wish to tell stories about "real vampires" you should look into old folk stories, especially eastern Europe folk.
They see vampires as evil monsters. Since stories about this subject come from THOSE parts of the world I'd say they are nearest to the "truth". The name "vampire" originates from Slavic countries.
Even the older stories from Egypt, South America and Asia talk about evil bloodsucking creatures, often considered demons; since there was no open term for vampires.
Everything else are just goth stories and Hollywood movies.