Great questions, and you need to familiarize yourself with the correct answers. Generally memorize the protocols. I’m going to regurgitate what I have internalized & point you to online resources to educate yourself further.
Preparations made well in advance really give an advantage to survival.
As soon as a nuke is dropped, go the fuck home. Turn on your faucets & fill all sinks & bathtubs, as this may be the last of your easy, clean, potable water you’ll get from the grid for who knows how long.
One of the biggest & best things you can do is shelter in place, I think for a week. Radioactive fallout & the heavy alpha particles will be everywhere, and blow everywhere. Cover all windows & doors with Visqueen sheeting & duct tape, control & eliminate the travel of random-ass particulates. After 1 week, the radioactive potency of the dust particles should be reduced by 85-90%. That’s huge. So shut your windows & doors, seal everything up, and sit your ass down. It could save your life.
Shelter in place requires food, water, preps. I think it’s overkill, but overkill is also kind of what you need/want, 1 gallon of water per person per day. When Russia started getting on their shit, people were buying up iodine tabs. This harmless substance negates the harmful effects of potential radioactive exposure via your food & drink. The trick is you have to take this stuff a set amount of time…before…exposure to radioactive particles. It protects your thyroid gland, IIRC. Have water, have food, maybe have a container or two of those fancy tablets.
Especially in the earlier days, you help others by being able to help yourself. If there are assistance efforts, you can turn them down & the help can go to others in more dire need.
We can, and do, talk about prepping things for years on end. I would recommend you tune in to Canadian Prepper (hey,I watched some of the video after & I didn’t do too badly!)
Yes, Canadian Prepper touches on this. In my words: information is good. But the authorities, and other people, may lie or not tell the entire truth. They tell you what they want you to know. Good advice in general.