Probably one of the quickest ways is direct mail, if you use Mudlick follow their directions once you get them in, I would suggest expanding your hours 7:30-5:30, make it as convenient as possible, the WOW factor, Motorev will help get you rated on Google, also would suggest putting pic on your website with your wife if she's involved, pics of you, your staff will help, also my wife has been involved with the local chamber as an Ambassador going to ribbon cuttings, meetings, passing out cards and brochures.We're also a part of a network group which has worked for us. If you think of your customers as a part of the anatomy I won't repeat represents a bad attitude toward those that sign your check and it will come through, they won't come back!
You might check out http://turnaroundtour.com/libraries/showcase/page/5/ which is free. A local shop, franchise opened awhile back, even gave away free oil changes, but failed to impress the customers when they came in, even made some mad, from what I hear have struggled ever since.
Make a good first impression. Good Luck!