That’s it. Plain and Simple. Share.
People always want to know what is the best way to advertise or market their product. “How did I let people know what I am doing?” Well, are you talking about it? All advertising is is a very shiny magpie way to share the “benefits and features” of what people are selling. And a low key low cost way to do that yourself is share. When ever someone ask what you are up to. Tell them! Even if its the acquaintance who your occasionally talk to. You never know who that person is or who they know. Better yet share what inspired you to start the business. Everyone loves a good story, and while they might not need your product now they’ll have you and your story in mind next time they make a decision.
And to make sharing easier there is a wealth of “social networking” services. Since sharing is a social thing. Twitter, Facebook and Youtube are just some of the big ones. But there are a host of others such as SocialPicks, Kiva, BakeSpace, deviantArt, and Patients like me that might be more applicable to you and your field. By becoming a part of a larger community ( not just spamming them to spend money with you) you allows others to contribute to you and you to others. Who knows you might get you next big idea.
So share. Share what you are up to and share what you are passionate about. You might be surprised about the results.