In this day and age people like working with people for 3 reasons, because the KNOW, LIKE, and TRUST you.
One of the major things you have going for you, is that you are NOT a salesmen. You DON'T want to become one either. You have the ability to walk up to someone and speak to them as an expect in your field, and simply offer you services.
If I were you, I would definitely consider a website and at least a business card. Get some examples of your work together for you website.
The big thing is, just be yourself. Get out there and you will get business.
Good luck to you. Let me know how you make out.