Advice for a new serviced based shop in OKC - drumming up business

Looking for some advice from the more seasoned shop owners.
Little history on me. Almost 19 years in the trade, and recently left my old employer to venture out on my own. So my wife (a disabled veteran) and I got our LLC, and got the ball rolling.
We have the truck, the equipment, plotter and flexi 12. All the standard fare, and now we need the phone to start ringing.

What would be anyone's best guess at the best way to start drumming up service calls, and wall cabinet / channel letter jobs ?

thanks in advance
Mike
ML Sign Service
www.mlsignservice.com