1. Do Press Releases

2. Build Infographics and share them on Twitter, facebook, google plus and pintrest

3. Submit Guest Post

4. Create video content of your products and share it to sites likes youtube, vimeo and etc, and if you can give a voice over product description in the video it would be great.

5. Use Tools like OSE and check where your competitors are getting linked from and try to get linked from those sites. If the sites are spammy, don't get linked with them

Best of Luck..