Best way to achieve the following layout
Try Single Page Website module. Its a good option for this kind of website. Just create menu and give proper link.


  This module provide the ability to display the content of all menu items of the menu that you indicate in settings on the Single Page Website module.
  On the page 'single_page' the links in the menu will be replaced to the links to the correspondent anchors.
  You can set URL 'single_page' as front page of your site, and your visitors will see the Single Page Website. But it will be the site managed by Drupal 7.