I always get excited for people who are wanting to follow their passions... Make sure you are considering your options in terms of a web presence. You have a better chance of getting the domain name or website name of your choice with a .WS domain. AND you can make extra money on the side as well. I have made money every month for over two years now for a little work I did way back then.
Go to www.myhomeoffice.ws and make sure to click on "more info" after the short presentation.

Since you love graffiti and cars, have you considered putting together some unique designs that could be painted on cars?

Good luck with your dream of working for yourself!

jim@myhomeoffice.ws