I met a man I thought was a vampire once. He drank blood.
Omg really? i have never heard of that, does he see his reflection in the mirror :D
I'm not sure about that part but usually they are known to drink the life essence of beings.
do they behave like real vampires? i cant imagine that vampires are real :D
It depends on what you mean by real. Vampires were popularized in the West and there is a lot of stuff that comes from popular media then there are the myths and legends of old.
I know that the word vampire originated from Serbian language, Serbia is really close to Transilvana, so i think thats where it all begun 
Is that right? Where was the first vampire from?
I think from transilvana nowday romania, vlad wanted to scare off the ottoman invaders so he killed the whole city and put their heads on a stake in front of his castle, so the vampire was born 
Yes Vlad the impaler, he was also known as Dracula isnt that right?
Yes, yes the count dracula, really famous in books and movies even today!