Congratulations! You’re not dead! 
Yet.
See, not being dead is a good way to start surviving the Zombie Apocalypse. But you have to keep not being dead.
You have a secure place. That is, you can do what you need to do inside, and the zombies stay outside. Shelter is only one of the three primary things you need. You also need food and water. If you’re like most people, you’re going to have to find a better place. A bit of land with a well, a spring, and/or running water would be ideal. You can probably scavenge enough food to keep you going for a while. But what are the odds your new patch of property is going to have a defensible structure? You’re going to have to be lucky.
I’d go for a property not only with water, but with enough land for growing crops. In The Walking Dead, Hershel had his farm. Fortunately he didn’t have to deal with zombie hordes for a while. Rick & Company had the prison. It had a secure structure, and plantable land with fences to keep the undead un-in. Maybe you can figure out how to drive a truck. Hey, it’s possible. If you can figure that out, maybe you can figure out how to move storage containers. You could build a nice little fort around your house. Heck, with some ingenuity and a shipping yard nearby, you might continually expand your perimeter.
So you have a defensible building. You create a secure perimeter using shipping containers, fencing, log palisades, or whatever. You’ve chosen a place with water, and you’ve found enough food for a while. You remember watching movies where the hero shows someone how to build a snare, you have some firearms, there may be fish in your water supply. Or you live near the ocean where you can gather sea life to eat. Hitting up the local hardware stores and nurseries, you get seeds and plants to grow between your house and perimeter. (If you’re up here in the PNW, those damned blackberry bushes will suddenly become somewhat less accursed.) Hey, gather some livestock (chickens, pigs, etc.) while you’re scavenging. You’ve probably gathered a bit of wood if you live where there are trees, and there are plenty of houses you can dismantle for wood. Lots of propane tanks in my area, which could be transported to your fortress.
So you have shelter, a protective barrier, water, food, and fire. Now what?
You’ve got to kill zombies, right? Why not use them as an unnatural resource? You could render their fat for Diesel fuel. Not ideal, but it may come in handy. Their clothes could be burned to melt the fat, as can the leftovers from rendering. (If you’re burning the bodies anyway, you may as well render them first – though I suspect they’ll be harder to burn without the fat.)
There’s probably a solar energy store not too far away. Stock up! Cost is no longer a factor, so you can put up as many panels as you have room for – remembering, of course, that you need space to grow food, too. Maybe you could salvage a bunch of automobile alternators and turn them into windmills, too. If the zombo-Diesel works out, you might find a generator that will run on it. People have used animal waste to generate methane. That could be another source of energy.
OK, that’s just spitballing a couple of ideas for staying not-dead, and providing yourself with additional resources. You still need to deal with the un-un-dead, which can be far more dangerous than the un-dead. People are still going to try to take your stuff. If you’ve built your fortress single-handedly, well done! Gathering materials, putting them together, and looking out for hungry ghouls? Quite formidable. It would be good to have a small community to help with the building and guarding. How do you decide who to let in? We saw what happened to Terminus. OTOH, Rick could have let more people into his tribe and they could have been stronger. You’re going to have to trust someone – a lot of someones – if you’re going to make it long-term.
You wake up one morning, and the world is going to Hell. Let’s hear how you build your place of safety and build a community.
Note that this depends on magical zombies that don’t rot into harmlessness, can eat as much as they want without evacuating or bursting, are incapable of rational thought, and can be killed permanently by damaging the brain.
