Output block in particular region from custom module drupal 7
The way you are trying wouldn't work as you are creating a page by
creating a menu item. Rather you should visit your block administration
page at www.example.com/admin/structure/block. Here you will see the list
of all your blocks and available regions in your theme to assign
the blocks.

Here is a screenshot:  

In the screenshot where you are seeing the select list with none as selected. This list will let you place your block in the available region.