How to draw perspective lines?

Question: How to draw perspective lines!?

How to draw perspective lines!? I'm trying to airbrush city street scenery but I have to clue how to draw perspective lines for that!.
http://i38!.tinypic!.com/vyy6b!.jpg
Lol don't laugh, I just made that "sketch" quickly, I know it looks kind of ghetto but I made this so you can have a clue what kind of scenery im trying to make!.Www@QuestionHome@Com

Best Answer - Chosen by Asker:

The vertical (side) lines on windows are always straight up and down!. Simple solution, change all your verticals (walls, windows) so they are always parallel with the sides of your paper!.

Walls become shorter as they move away from view, taller as they come closer!.

Here's a great tutorial:
http://kingfishers!.ednet!.ns!.ca/art/grade!.!.!.Www@QuestionHome@Com

*hint* use shadowing!. it helps alotWww@QuestionHome@Com