Sorry, I didn't save the topic about adding passers-by

Sorry,I didn’t save the topic about adding passeers-by.
I’ll write it in points
1.How add to pedestrians
2.How to make it possible to run them over and at the same time shed their blood after being run over?
3.How to add physics,for example,when a car accelerates into another car,and smashes.
THANK you for answer .I’m asking because I’ve already made a lot of maps,leveled it out and slimmed it down a bit so that it wasn’t too thick
I know how to make cars
If you help me. This could turn out to be a realistic bloodbath. :smiley: