1) Regarding killing people who will not worship the image of the beast in Revelation 13:15, my thought is that this only applies to people who are physically close to the image of the beast. So people who are geographically far away may not be killed. In any case, the woman flees from the dragon and is able to escape in Revelation 12:14, so the dragon and the beast have limits to whom they can kill. Moreover, Zechariah 14:4-5 indicates there are some people of God who will flee when Jesus comes. These people probably do not follow the beast and they are still alive enough to run.
2) Do you think Jesus comes as a thief for the rapture? If yes, then from Revelation 16:15, Jesus has will come for the rapture after the sixth bowl.
3) We can discuss more in the future.