scale buildings for new movie

the major toy train scales are
N: 1:160
HO: 1:87
O: 1:48
G: 1:28

i use N and some HO. you can buy plastic people, pets, buildings, cars, etc in wide variety
in both HO and N, which are the two most popular scales. trainworld.com is my favorite
source, and internettrains.com is also good. they have decent web sites. HO might be better for your needs as N stuff can be pretty tiny. I have some HO cows and an N train station, about 3 inches long.