Joomla update from 2.5.28 to 3x.

Hello, I have a very old joomla website, last update was in 2007. I need to update it from 2.5 to 3.xx the automatic update is not working. Also, most of the images are not showing on the website i am using K2 for articles.

I need someone who is expert enough to handle the project here is the link http://rockeramagazine.com.