I’ll also add about the radiation thing - the vast majority of the radiation from a nuclear explosion will be gone in just a few days. Even if you’re close enough to be affected, staying indoors (turn off air conditioning/heating though) and on the lowest floor possible of the building you’re in will protect you from most of the actual radiation. Again, the big issue is breathing it so sealing windows if you’re able could also help.

Media definitely overestimates the area of effect and timeline of destruction. Make sure you get a crank radio (they usually also double as flashlights and can charge your phone) and info will flow about response, even if it flows slowly and clunky at first. The good news is this applies to other disasters that are far far more likely to affect you, like severe winter weather, hurricanes, or wildfires.