Naming convention for Drupal views
Views has a nice built-in way to help you decipher which template filename(s) to use.

Open up your view in edit mode, go to the display that you're interested in, and open up the 'Advanced' tab. Right at the bottom you'll see the "Theme: Information" link. Click that, and you'll be presented with a popup that looks something like this:



Once you've decided on the right filename, create the file and populate it, then make sure to clear Drupal's theme registry caches or the changes won't get picked up.