Requirements to develop website like this

While I can't be sure, I suspect a site like w3schools was developed by a team because few people are experts in everything web related.  The pages appear to be all developed using ASP.  However, PHP would work just as well.  You could also use Python.  

I would also strongly consider using a framework.  Django is a framework used with Python.  Django was written to allow for the rapid deployment of news.  Other frameworks are available for PHP.  I suspect the same is true of ASP but I don't write ASP code.  (ASP stands for Active Server Pages and is something developed by Microsoft.  I prefer to work in Linux so I tend to use PHP but have used Python.)

If you want to explore the PHP path, now that you know HTML and CSS, a good next book to read is here  http://www.amazon.com/PHP-MySQL-Novice-Kevin-Yank/dp/0987153080

Note, Amazon isn't the only seller.  You might be able to find a better price by shopping.

If you are in a hurry, I suggest you will have to hire someone with experience.  If no, perhaps you can learn to do this yourself (and you can ask specific questions about what you are doing here at Experts Exchange).  Regardless, I suggest reading that book or one like it.  If you have someone else do it, knowledge is good to have since you'll be the manager/boss.

Hope this gets you off in the right direction.

You asked about time.  That's pretty much impossible to answer without knowing the skill level of the person who will actually do the work.  A skilled person using a framework might go pretty fast.  Someone else, much more slowly.

I certainly can't predict how much time it will take you to read a book and learn.  We all learn at different speeds.

@hmccurdy,
I have knowloedge in PHP and MySQL.
How to design a site like dbreader.com or w3scools.com
Functionality of website should be like attached JPEG.
When user clicks on any tab left side list(div), relevant output display on right side division

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