Sorry I missed your post - have had flu and support has been delayed.
Setting up a blog is easy and is controlled by the type of menu you create.
If you navigate to your Joomla admin and then to your menu manager you can add a new menu item - perhaps start by working on your main menu.
You will be prompted for the type of menu you wish to create - select articles initially and then select one of the blog layouts - you an control what categoris from your Joomla site will be displayed by setting various parameters.
I will make you a short video tomorrow showing how to do this - similar to the ones added to the blog today:
blog.joomlabear.com/