Now that you have installed WordPress to your main domain or a subdomain, you are ready to design your site. Remember that WP automatically installs Twenty-Fourteen as the default theme for any Wordpress installation during the calendar year 2014.
The Wordpress help codex includes a a help page that shows you how to switch between grid or slider layout to display content and using the featured tag.
Here is a good video tutorial on customizing Twenty-Fourteen:
And a nice Twenty-Fourteen demo page for wordpress.com.