You could try creating a new article, with the header/title you want, to link it to the left menu you want to, go to it in the menu manager, and change its type to "content- article layout", and choose the article you made.
Have you read any of the Joomla! help for newbies? There's a LOT over on the J! Forum
Edited to add: I was just browsing round on another Forum, and found this link: http://www.opensourcenetwork.eu/content/blogcategory/78/775/lang,en/
there are a lot of video tutorials there from what I saw...I haven't watched any, but you never know, they just might help you with Joomla!