Ok.. here's what I did. First I went down to Office Max and made myself some business cards and stuck them up all over the place. In my apartment building laundry room for example. Down at the coffee house.
Then I made a website
www.bayareaflying.com
Then I joined several websites that direct students to a flight instructor in their area.
The best way though I found was by word of mouth... talking to people that were training where I did my training. Use the contacts that you have.
These are a few ideas... good luck.