Online marketing for small business is really a long-term activity. But if you have decided to start the first step, here you can follow me for some general steps and tactics. 
1. Create a website for your business or you can rely on other business platform. You should provide a steady and real platform where customers can find you. The website introduces to customers products and services of your own.
2. Promote your website and business. Online visibility and brand popularity is what you want. Direct traffic to your website and get more people know your are selling something they want.
To promote your websites, you may try seo for ranking and ppc for traffic. These two tactics are the common tactics used by business owners. You can learn about link buiding and ppc online.
3. Social circles improve your popularity. The benefit is that social circles allow you to stay close to people and direct traffic. Try to promote your site and brand on social sites like Facebook, Twitter, Pinterest,etc. Try to find your fans and followers here.
Article marketing, email marketing and other online marketing idea are worth your trying. Hope my words help you and good luck!
