After I get done with modeling my house how do I change the color? I want everything to be as close to it as possible from the carpet wood tile and wood grain around the door. Do I use blender to do this or should I use another program and try to import the colors in?
Your question is too general for a specific answer.
Start reading here about materials http://wiki.blender.org/index.php/Doc:Manual/Materials
Start reading here about textures http://wiki.blender.org/index.php/Doc:Manual/Textures