Actually creating a website like the New Naijaloaded is not that hard and if you are one of those people looking for on how to create a site like Naijaloaded then you have come to the right place at the write time.

Naijaloaded is built with wordpress using Carrington Mobile V 1.1 wordpress theme and thats why its easy.
To get started all you need to do is host yoursite and install wordpress and then search Carrington Mobile V 1.1 using google, then download it and goto your wordpress dashboard click Appearance/themes/addnew on the top of the dashboard/upload then locate the Carrington Mobile V 1.1 theme you downloaded and upload it when complete, view your blog to see the changes and new looks.

If you have any experience of coding then start coding and adding any other features you wish to add because all the things you need to design the blog is already inside ur carrington theme..u can locate this inside /themes through ur ftp...code ur header and footer and d rest.

Hope it helps and in case you still need help don't hesitate to ask, i will be willing to help

You can as well read this:  Do You Need Well Designed Forum Site Or Blog?