Paul Graham delivers an informative (and highly amusing) talk: "Before the Startup", in Lecture 3 of How to Start a Startup.

See the slides, readings, and more, at startupclass.samaltman.com/courses/lec03/

View the annotated transcript, and add annotations of your own, on Genius: http://tech.genius.com/Paul-graham-lecture-3-counterintuitive-parts-of-startups-and-how-to-have-ideas-annotated