OK the basics?

You can see the backend editor right? If so, the Umbraco instance is up, but you are not seeing any pages.

Try and check that you haven't set a hostname on a specific node.

In the backend go to any page of content and click the Info tab (top right) and have a look at the links.

You should see at least one valid url.

If you see

This document is published but its URL cannot be routed

then you have setup a domain name further down the node hierarchy.