A thought brought about ye olde joke of "vampires aren't actually repelled by garlic":
One of the main thing that comes up pretty much any time I read something about vampires says things like: "Oh, crosses, garlic, running water, etc all of that is bullshit." So if you found yourself believing you had a vampire problem what would you do? Would you think garlic works? Crosses? (What if you thought you had a werewolf problem? Would you think they were stuck to changing on the moon? Or no?)
I'm interested less in any theorycraft about what would actually be truth about these myths and pop culture ideas if monsters were real, because obviously they aren't real. I'm interested in what a modern person might think about these monsters, how the change in "myth" and "legend" has altered the human belief.
Myths and legends were based on things we didn't understand, couldn't explain, or were afraid, etc. Now we've sexualized many of the things we were previously afraid of. (What does that say about the human race?) I'm kind of rambling at this point. But let me put it this way:
You're making a character who is a modern person who believes they are hunting vampires/werewolves/etc and learned what they know from pop culture-- what would they do?