Google may have not crawled your website yet. It may take 2 or 3 weeks.
From google support: Google's spiders regularly crawl the web to rebuild our index. Crawls are based on many factors such as PageRank, links to a page, and crawling constraints such as the number of parameters in a URL. Any number of factors can affect the crawl frequency of individual sites.
see also: https://support.google.com/webmasters/answer/70897?hl=en
You will know it did when you start seeing statistics in your webmaster tools. It's more of a trial and error here.