Landing page : A landing page is a very first page of a website. For example, if you go to http://www.google.co.in/ you can see a page that specific page you view for the main domain is called a landing page. The very first page of the website.
Likewise, I would like to setup a page that should render or show up once an end user hits an URL http://www.website.com and can able to see a page, where the page should have a layout designed by me and using theme files of drupal 7.
It is very difficult to understand what exactly you are asking.
This may help answer your question: Drupal - Replace the home page