How to Advertise?

I established a website for my dad's used car company during the past semester breaks. Because of the economy crisis that is becoming more serious now, a lot of business fields are being affected, including my dad's shop. So, i'm hoping to help my dad a bit in his business by establishing this website as an advertisement for his company. But the problem now is how to direct more people to this website and get to know the existance of the company. I have tried posting as bulletin in friendster and put in the forum of international car-trade website, but still not so efficient. Anyone got any suggestions? And i would be more prefer if the way to advertise this website is FOC de,k? The website url is: www.acliong.webs.com