Can you clarify what happens when you attempt to access your site?
One thing to note is that WordPress makes heavy use of rewrites in order to support easy to read URLs. On Apache this is done via .htaccess files and you only need to ensure that Apache is set to use them. On Nginx you need to manually configure your rewrite definitions in your configuration file.
We also offer a LEMP one-click image which comes with the stack all installed and ready to go. To use it with WordPress (for a new site) you would only need to:
mysql command with the MySQL root password shown the in message when you log in to create a new database
create database mywpsite
Download WordPress and place the files in /var/www/html (make sure to remove the index.html file that is there)
Using the Nginx link above set up your rewrites
Restart nginx so the changes that effect
sudo service nginx restart
Navigate to your site in a browser and complete the setup.