wow mane...you have alot of work to do until you will make a god interior.
You have problems with the interior lighting...
What engine render you use ? I sugest you to learn Vray
it's very god and easy to use...
Here is some links with tutorials.Good Luck
Vray Interior Lighting - Introduction - trueSpace Community Forums :: 3d Studio Tutorial :: vray tutorial, interior light setting 3DTotal Tutorials V-ray light & Material Setup