We know a lot of the details about that day because of Pliny the Younger whose historical letters describe his experience during the eruption while he was staying in the home of his Uncle, Pliny the Elder in a nearby town.
There is an excellent best seller novel that covers much of the detail you are asking about. “Pompeii” by Robert Harris. You can read about the book here:
Thank you.
Thanks APD, and the translated original is around here somewhere...
http://www.eyewitnesstohistory.com/pompeii.htm
Pliny the Elder comes off a little like Baghdad Bob, btw.