Search Engine Optimization is important, because
1)Start getting links from the relevant sites.
2)Find out the relevant blogs and ask them to publish your post from their blog roll for tha you can provide them good content for their blogs.
3)Increase facebook likes and followers on twitter,ask your clients to follow you and start following the relevant people.
4)Think like a user and develop your content in this aspect and market it as you can.Content should be informative,interesting and user friendly..