I need to make something like gallery of magazine covers in joomla, and after clicking one image, it should open a page, where viewer would see an image of cover (that he could open in full size) and table of contents with links to some articles. Administrator should also be able to (reasonably) easily add a new covers with content to a gallery. I'm more like a Drupal guy, so I'm asking Joomla guys - what would be the best/easiest way to achieve this (including using extensions etc)? :)
You should be able to do that within the standard Joomla framework. In this case -
This can definitely be accomplished with the K2 extension, but you can probably do it within the Joomla category/article framework with some simple template overrides.