In Google webmaster tools under Subscriber stats, it is always in the state: No data available. (Why not?) I want to ask it to do? google and how to display data for that tool
How new is your site? It may take a while for a new site to get spidered, indexed and receive search traffic. By a while I mean it may take months.
Do you have links pointing to your site from other sites. aka backlinks. Without links from other web sites the google spider will find you difficult to find and might not index you if it does find. Try to ask some similar sites to link to you or ask some friends to do so.
Create a sitemap.xml file for your site and submit it via the google webmaster tools. This makes it easer for google to index your site.