This is my forte, okay? This is what it was like where I'm from and this is what I do. I've dealt with these things before. So if you want to live? I suggest you do what I say.
Everyone needs to split off into groups of at LEAST two, but not too many to a group. Too many in a group has a chance to get messy and hard to control. I'd say the cutoff is five or six. Before you even think of leaving your cabin, drink the antidote-water. The weapons are all in front of your door so I suggest you take them.
Shoot for the head. The arms and legs are okay, but the head, you'll take them out instantly. Saves ammo and time. If you're not any good with knives? Use guns. If you don't have to? Knives are equally effective, but you'd better be damn good with them or else you'll be bitten.
If you're bitten? Don't panic. You have the antidote in your system, so just get the wound treated and stay the hell away from any vampires in the area.
Any questions? Ask me.
Edit: Oz just suggested that everyone find something they're good at and do that, too. A post, if you will. We need recon; people to find guests and bring them to safe zones, people who are capable with guns or knives to take out the sons of bitches when they get here...anything you can think of that we'd need. Speak up.