Well...it would all depend on were the bombs hit. If (mainly my mom's side) of my family was safe, and most of my friends were alive, I would try to regroup with them and hide. Somewhere remote, somewhere away from the radiation and psychopathic looters soon to follow. If they were gone, I would (assuming I knew they existed) look for some groups like The Enclave, or the Brotherhood of Steel, preferably The Enclave. Even though they may shoot me on sight...it's still worth a shot! If neither of those worked...well this is going to be a real downer but... https://en.wikipedia.org/wiki/Suicide_pill
Well, I'd obviously sit on the roof and pray to be ghoulified. I have a chance, no way the bombs would be falling in my town, it's a small place. But the radiation would surely get to us eventually, considering there is one or two important cities near me, so I hope it would provide just the right amount of radiation not to kill me but to turn me into a ghoul.
After that, well... I'd stay where I am. No way I'd be going north, there's no telling what kind of effect radiation had on freaking Amazônia. There are uncatalogued species up there, plus a nasty kind of spider ("Armadeira"). But realistically speaking, I doubt Brazil would be bombed, unless we go even more crazy and make even more poor decisions by deciding we're fit for war.
Well, the closest major cities to my village are about an hour each way. And these are Canadian major cities, like Hamilton, so I don't even know if I'd be ghoulified, given that no bombs would drop anywhere near me. If that was the case, and I did survive with my village mostly intact, I'd get to work turning it into something like Woodbury in TWD, except, you know, I wouldn't be a homicidal psychopath of a leader. The most important thing would be to find a non-contaminated water and food source, and to put up walls to protect against raiders and gangs. Then I'd let it function as a haven for wanderers and misfits of the wastes. I don't think I'd be off too badly.
Assuming I'd survive the initial detonation, I'd start by closing every window, shutting down the vents, etcetera. That'll take me three minutes. Then I'd use the few minutes I have left to gather some food; there's a store two minutes from home so if I act quickly I can probably get some canned food. Provided that the bomb doesn't hit one of the three main water supplies in my area, I could probably live for a few years without having to go outside, exposing myself to the radiation. Boredom could be a problem, but I've got plenty of books. Main thing to keep in mind is to wash your hands before you touch food, because while most radiation cannot pass through your skin and muscles, if you ingest it you will get cancer in your stomach. You don't want cancer in your intestines, it's not curable. Well... that's my plan.
That's a good question, and a tough one to answer...
My town, though it's small, does have a nuclear reactor near it - making it prime target for a nuclear blast. Because of the radiation that would inevitably flood my town, I would either die or turn into a ghoul.
If I was able to survive the initial blasts - even though I would be rather ghoulish - I would look for survivors and try to find a radiation-free area to set up a small settlement. I'd likely attempt to set up trade routes with anyone else nearby as well, because we'd need to work together to survive!