First find the sites to put that backlinks on. They must be relevant for the people targeted by your website. For example, if your website is about bollywood stars, it makes no sense to have backlinks on sites about, say, cars or computers or politics. And if you concentrate on visitors from India, it makes no sense to have backlinks on a site about san francisco, however high its quality.

Then ask the webmasters of those sites to put a backlink to your site on their site, or do it yourself if you have access to that site (for example on the facebook page of your company or a local directory). Somebody has to do it, you know, it won't happen automatically.