From Jake Steinfeld, I've Seen A Lot Of Famous People Naked:
I can't reach into your heart and adjust the horizontal and vertical. 
So before we get started, you've got to make sure you've got a clear picture of what you want. Ask yourself these questions and write down your answers just to be certain:
Is this something I want to be doing every day of the week?
Can I see myself doing this for the next five, ten or twenty years?
Will I be able to sell this idea to investors, partners or employees?
Do I see endless opportunities coming out of this idea?
Will This be so much fun I won't want to take days off?
Is it the sort of thing I'll be proud to be a part of?
Does it match up with my interests?
Would I do this even if nobody paid me?
Is it such an exciting thing that nobody can talk me out of it?
