Welcome to the bonus section! Here we are going to do a quick render with the Blender Internal render engine to get an idea of what the whole scene will look like. Note that this is totally optional as we are going to create a render with cycles later. In order to do our render, we will need to add a material for each object in the scene like we did for the walls but with their corresponding textures.
Now that we have all our materials created we will need to turn up the lights! Of course if you don't have light you won't see anything like in the real world.
We add a sun lamp (press Shift + A and select Lamp | Sun) and change its color to a grayish yellow in the light settings situated in the Properties editor. We leave its energy to a value of 1. We place it behind the house and rotate it so it hits the back of the house.
The next light we will add is point light. This one is going to be much more intense so we bump up the energy value...