Cpanel has many help options built into it, including Video Tutorials and a Getting Started Guide. When you have logged in, look for these links in the top menu box labelled "Preferences". You can also click the help icon at the top right of the screen, or the links for Documentation at the bottom of each page.
Cpanel allows you to install many progams like Drupal and Joomla that maintain their own support sites. Click over to the 1-click install list for links to these sites.
We recommend Wordpress for blogging and even for many CMS needs. It's easy to install from our control panel - just click the big blue smiley icon for Fantastico and follow the instructions.
If you have a question, try Wordpress Answers.