Remember, you’re in this for the long haul. Patience and persistence are key when building links to any site regardless of industry. If you’re in a low competition industry, you may get results within 6-8 months. High competition industries begin to show results after a year and are essentially a never ending battle. Consistency is everything and while it doesn’t get easier, the results are worth it.
It’s good if you have an SEO strategy to make your website become visible to Google and to the thousands of potential customers that type in relevant queries every day. So the higher you rank, the more traffic (and subsequently leads and sales) you’ll steal from them.