For one the yellow pages. Two, you need to start getting accounts with businesses. Go to a new club, tell them someone illegally parks in your lot or somewhere they are not suppose to, you tow them. You get a fee from the club and the impound you take it too. Put up boards at gas station, small ones or as big as you can afford. Go to State Farm agents and have them recommend you for a kick back price. Also place NICE business cards and flyers in your area. Register your business with Google. Hustle.