Look for complimentary businesses in your area with whom you can connect to begin creating a referral network. I agree with devid_john that a strong email marketing strategy is key. Networking isn't exactly free but it's low-cost and can have a good ROI when done correctly i.e. find networking groups and events that you resonate with AND where your ideal customers are. Your local chamber may or may not be a good fit for you, so look around to see what other business networking groups are in your area. A high-probability prospect list + direct mail helps too.
Good luck silverbling! Much of marketing is trying different things, figuring out what works and repeating it over and over and over. Let us know how it goes.
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