Create buildings
 

I got a blueprint and pictures of a building. They asked me to model it. Told them it would take a while, but what is the best way to create real looking houses? Is there a tutorial on how to create them??

box model it as close to the plans as possible, if you have photos of the building then texture it using them and then set up some lighting and render away :)

try a google search and you'll probably come up with results or at least different techniques to modelling which you can use on your building.