Just write a good content of your niche with the latest information and share it on the social media and web 2.0 sites .

1 Write a good quality content .
2 Do blog commenting on relevant content sites.
3 Make a good use of the social media sites .
4 Forum posting is also the best way to make good links
5 Do dir submission
6 Use the web 2.0 sites for getting back links to your site and promote them.