1. First af all forget about buying backlinks at all. Google gonna eradicate black hat SEO in the next few years. Buying links bit by bit becomes a countereffective strategy. 2. Think about traffic more than about links.Traffic from social networks can indirectly effect your SERP position. When people see you and visit your site they become used to you and they start requesting Google about you. This strategy`s becoming more effective than oldfashioned link building. So concentrate on unique viral content and how to attract attantion to your page in G+ and FB. 3. Order full SEO audit and your competitors analysis (for example Google 'seomall full audit'). This will help you to get idea what onpage SEO you lack and what SEO your competitors successfully do. 4. Order some testimonial video on Fiverr. Ask actors to pronounce your keywords (1 or 2, not more) and link clearly and loudly. Google pay attention to this sort of audio keywords. 5. Add a blog to your site. Update it once a week with unique and viral (if possible) articles. 6. Create a G+ page and attach it to your site. Google do everything to push forward their social net. So G+ gonna turn into a pretty powerful SEO tool. Hope someone add some useful tips to the list above.