hooboy. link building has changed quite a bit over the last year. the blog commenting, article marketing, press releases, etc have been devalued quite a bit over the last year. Actually I don't think those tactics are even worth pursuing.
Getting a link is now not only about getting links from relevant sites, it's also about getting social media shares, like tweets, Facebook likes, google +1's, linkedin shares, etc.
If you're a small business and are looking for low hanging fruit, maybe just try to leverage your own personal network. For example, are you on any boards (for charities, churches, groups, schools, etc.) - could they add a link to your website on your Bio page. Or your vendors - could you be featured as a testimonial on their site with a link back to your site (not sure if this is still legit or not).
Otherwise the way that most companies do this these days is to write valuable content, which can be challenging if you're just getting started.