That can't possibly be the whole game.' And it's not you then make your way to Burial Point, the second half of the town of Redfall at which point the game inexplicably locks you out of Redfall Commons forever. Anyway, once you kill The Hollow Man, you're going to be thinking 'That was way too short.
You can kill them either with fire, by meleeing them while they're petrified, by shooting them with a gun that has a special perk to let you kill them (I only found one in my playthrough), or by draining their HP and then meleeing them with a weapon that has a stake attached (that would be either your shotgun or assault rifle). Humans die as they would in any game, but vampires are a little trickier. None of the human enemies are particularly difficult to kill, but they WILL swarm and obliterate you if you give them the chance.
In addition to the vampires serving as The Hollow Man's thralls, you'll have to deal with his army cultists and the Bellwether mercenary company, as well. You start the game in Redfall Commons where your main goal is to slay The Hollow Man. The game is divided into two halves with four 'vampire gods' that have to be slain numerous sub-bosses, some optional and some mandatory.