Although this video was created using AutoCAD 2008, the same commands and techniques apply to newer versions. View the tutorial that relates to this video.
The video below shows one approach to drawing the Office Space project. I've mentioned before in other exercises about drawing something like you would build it. In this case, I start with the outermost parts which are the columns. They are also dimensioned to give you the outer boundaries of your drawing. If you get this part right, then the rest of the objects should be easier to draw.
Look at the whole drawing, and don't just start in one corner and work your way around.