Drupal, how to display only specific content
If you have used Blog modules to create you blog content type, you would be able to use the default View from blog.

Otherwise you can create your own view and add Filter Criteria: Type.
You can do this using the module Views You can give the path blog to the view.


  You need Views if
  
  
  You like the default front page view, but you find you want to sort    it differently.
  You like the default taxonomy/term view, but you find you want to    sort it differently; for example, alphabetically.
  You use /tracker, but you want to restrict it to posts of a certain    type.
  You like the idea of the 'article' module, but it doesn't display    articles the way you like.
  You want a way to display a block with the 5 most recent posts of    some particular type.
  You want to provide 'unread forum posts'.
  You want a monthly archive similar to the typical Movable    Type/Wordpress archives that displays a link to the in the form of
  "Month, YYYY (X)" where X is the number of posts that month, and
  displays them in a block. The links lead to a simple list of posts
  for that month.
  
  Views can do a lot more than that, but those are some of the obvious
  uses of Views.