1. It's interesting, but you need a PhD in Chemistry and another PhD in Biology to understand the answer. There are probably like 10 non trivial steps from single molecules with 10 atoms to the RNA world, and we don't know any of them. If you would be happy to be sure that my hand waving is correct, you can ask it to be sure.
2. It is quite boring. A chunk of (liquid?) iron. I guess my metallurgy knowledge is too low to find the details interesting. I suggest to find another question.
3. It would be really nice to know that we would not nuke ourselves. Fingers crossed.