Everyone has pretty much nailed it with the weapons requirement. I'll add these to the mix, too, though:
1. a dog (protection, companionship, early alert system, etc.);
2. a woman (countless reasons on this one);
3. a nerd/scientist-type guy (who can create cool s*** to fight the zombies);
4. a medical doctor (can treat whatever);
5. a Jack Bauer, John McClane, Rambo-type guy (aka - supreme bad a**); and
6. a fully-stocked Walmart to fortify and use as my base of operations.
So, if you don't know these people or have these things yet, go network, move within walking distance, whatever. There's still time.