With the CM Disclaimer and Welcome Message for WordPress you can easily create and publish your warning message, ask user to accept your terms or publish a general notification that the user must accept before view the page. In each WordPress page or post you can add a particular disclaimer fixed on the middle or bottom of the page or a post.
This page shows an example of a welcome message. For more information go to the plugin product page
Here are the screenshots which represent the setting of this welcome message