Wouldn't be the first part of starting a business to have a product or a service you want to sell?
Is there something you love doing and you'd like to give to the world?
Guy Kawasaki calls it
meaning.
YouTube - The Art of the Start
Starting some website just to make some cash probably won't work (Or it will work, what do i know.)
btw: What's so bad about a job? Safe money, easy money compared to making it online. I am working part time. It's a compromise between doing what i love to do (make videogames) and earning enough money to live from.