if I am told how long it will take for the Nuclear Weapons to arrive at Australia I can edit my plan.
but if not, I will hide out in my local bunker ( which also happens to be a gun club. so I can has guns )
or I will rally with my friends and find a small pacific island to colonise to try escape the post-apocalyptic mayhem. or the actual nuclear strikes/fallout
You can't escape nuclear winter. When the wind blows all the fallout in the air spreads with it. So eventually you'll get sick too. Maybe not die instantly may take a few years for the cancer to develop. Or you may get fucked up kids with 2 heads or one eyed cyclops

. You know the words, cut off one head 2 more will appear

), but hey 3 heads are better than 2 right

)
Is this global Nuclear war or just a a tiny bomb destroying 1 city?
Global of course. If war happens I hope they bomb Africa first.