You need to do prmotion in social networking sites, bookmarking is also a good option, you can also buy them from sites like listingdock and Seoclerks. You can also use the link in your signature at different blogs.

Use Off page SEO technique to improve your web-site back-links.

Backlinks are the links that are directed towards your website and achieve entice visitors.

Blog commenting is the way to add your site url when commenting.
Forum posting is to reply to the thread or create new thread. Use signatures to create backlinks to your website.
Post on social media sites for visitors count on your website.
Add your site url to social bookmarking sites to get extra backlinks
Submit your article to article submission sites such as ezine articles to get traffic boost

You need to Focus on Articles posting, blog submission, forum discussion & Press Release that gives do-follow backlinks for your website.

Build backlinks from high PR websites and Do follow also.

Off Page SEO technique using to increase the number of backlinks, visibility of business, traffic and etc.

Use below talk to increase the backlinks:

- Directory Submision
- Social bookmarking
- Article Submission
- Forum Posting
- Classified Ads
- Press Release
- Document Sharing
- PDF Submission
- Guest Posting
- Questions/Answer sites


These task will help you increase the number backlinks.