Can i pls know how to customize the header or page links. I want to align the page links to the right. How would we edit the standard header section having page links.

By this I assume you are referring to the "menu" or "navigation" typically built into a website.

The standard navigation system for DotNetNuke is called the DDR menu. Our recent tutorial series on building a DotNetNuke skin also touched on styling the DDR menu. We also have a specific tutorial for the DDR menu. You will find more information in the DotNetNuke Wiki at DotNetNuke.com.

Can u provide the links to the tutorials and videos which deals with custoizing the Header of the page.

Try:

Issue 73 - How To Build Skins For DotNetNuke 6.x
Issue 62 - Evotiva DNNBackup and DNN Garden DDR Menu