1)Like the day of or the day before.
Basically, we establish a little back story and then it hits.

2)Dunno. I don't need a villain, but maybe you do...

3)I'm telling you only. Adrian doesn't really have anyone else to tell...

4)?

5) I'd rather work it in a way that the meteor is 'drained' of power or whatever. I really don't feel like hiding from the government.
But it's ultimately up to you on this one.