Another take on one point perspective to help you master this process.
The artist, Frank Curkovic, recommends moving the vanishing point. Do try that, it makes for some interesting outcomes.
Also, take advantage of this article, How to Draw Perspective.
This video shows how to draw a room using one point perspective. To make it more interesting, try placing your vanishing point somewhere else instead of in the centre as illustrated in this video: http://www.youtube.com/watch?v=7ZYBWA....
Skitch was used to draw the picture with SnapzPro to screencast. The video file was then imported into iMovie to add the titles, music and narration.