Oh, IC
A classic "Zombie" question.
Anywho, in a Dawn of the Dead scenario, I think your best bet is a walled city or fort, since zombies aren't especially intelligent in their attack. A simple system of troughs and bladed weapons (to behead the herded zombies) should function well enough.
I would personally keep the guns in reserve for other living humans who might want my stuff (sorta like the shopping mall biker gang scene).
A very viable alternative to guns would be something like the compound in Road Warrior, where you have the oil pump and refining protected behind the walls and you use the flammables to toast zombies.
I would think that the at first you would have a huge zombie bake, but after a few days, the countryside would be fairly zombie free as they would all have been attracted to your fort by the commotion and summarily cooked.
Oh, edit to add,
I would probably be gathering as many living humans as possible and then I would try for one of the larger islands, such as Hawaii or Ireland, where we could then clear it of zombies and reestablish some sort of civilization.