GOOGLE - SketchUp
Google SketchUp (Free edition) is a 3D Modeling Program used in architecture, civil and mechanical engineering, as well as interior design. SketchUp lets you create 3D objects and designs, which can be used to design buildings and bridges, cars and airplanes, re-design the interior of your house, to create new furniture and to even create the house of your dreams. The possibilities are endless!
In order to make this as easy as possible, SketchUp provides you with a variety of tools that allow you to make many different three-dimensional models, including building, vehicles, statues, houses, etc..
please connect to this website below for tutorials:
http://www.sketchup.com/learn/videos?playlist=58