Wal Mart or a big box store. Pick a new store if you can. Zombies tend try to do the things they were doing when they were alive, so they're gonna head to the mall, or WalMart, or school... etc. Malls are a bad place to go. There are too many entrances, and not enough goodies for long term survival. Pick a new general merchandise or grocery big box store. You get lots of canned food to eat, and only one or two large entrances to guard.
I'd travel. I'd get myself a big nice motor home, and drive. I'd go to ammo shops, and get guns and plenty of them. I'd get knives and a crossbow with arrows. Go to gas stations and stock up on gas. If your really skilled you could make it yourself. Put barbed wire around my vehicle and try my best to find other survivors to band with.
Obviously not any big cities I would rather say the safest places to stay for more secure and safety would be Maunsell Army Sea Forts or Alcatraz Island and Alcatraz is the first place I'll be heading to whenever everything goes down of zombies possibly attacking everyone anyways back to the subject what you need to do is find a safe location like the one's I mentioned and try and get there taking with you supplies and lots of food and water to stay hydrated and alive, but then again both seems like are impossible to get to due to them both being surrounded by water so then would have to hope and find somebody like a army guy or somebody who knows how to at least fly an helicopter or take your chances and get a boat and go to them yourself bringing friends, family, or whoever you plan on taking with you and when there first make sure it's secured and no zombies or people considered a danger or threat to you and your group and take care of them, start unloading supplies and everything else, make a huge room into you and your groups place to bunk in together for the night for safety measures and next day get to work of making the place your new home....
make your way to the nearest military base or armory,find a armored personnel carrier that you can use to go to walmart,food stores,gun shops ect. to get supplies,(most armories have little or no windows and very secure doors)or you could just tell your teacher theres no such thing as zombies