Write a letter to everyone and anyone you know. Just let them know you started at the dealership and if you can be of any help call. Once they know they will tell their friends if a conversation about new cars comes up.
Next, be on the lot at all times, I have seen so many people waiting at their desk for someone to come to them, if you are on the lot you can approach people as soon as they start looking.
Take some of your business cards and post them around on area bullitien boards, usually the grocery stores, corner stores, pizza places etc. have them.
If you have a little extra money for about $50.00 - $100.00 per month you can advertise on the placemats in diner or local resturants as well as the local auto trader.
Hope this helps.