There is no sure proof way to set up lighting, every scene is different and requires different lighting approaches. ( welcome to the world of 3D ) Lights need to be tweaked in the light lab ( E icon, when a light is selected ) Materials have to be tweaked to fit the lights ( M icon ) Even though it's an indoor scene the sky attributes need to be tweaked too. Looking at your scene the first thing I would say is the walls & floor have to much ambient value. Here's what I would do, first I would go into the sky lab and make sun/moon shadows set to 100% Then I would take the walls & floor into the material lab and make the diffused value 100% and ambient value 0%. Then I would start adding lights ( one at a time ) where I think the light sources should be coming from ( like the lamp ) and tweak them as I go. Once I felt comfortable with the lighting, I would start tweaking the materials to fit it. Of course this isn't a sure proof way ( other may do it differently ) but it is the approach I would take.

Stephen Ray