Are you asking how to ensure you retain the copyright in the content of your site?
In most countries, you don't need to do anything special. The person who wrote the text of the site owns the copyright of the text. Similarly, the person who created the images owns the copyright in the images.
Adding a copyright notice is useful, as it reminds people that the content is copyright, but it doesn't in itself provide any additional legal protection.
That said, you should be aware that copyright theft is rampant on the web. No matter what copyright notices or statements you place on your site, if your content is valuable or interesting, there's a good chance that somebody will eventually rip it off.