Creating a theme isn´t the easiest to do, so I would do some google searches to find a theme.
There´s alot of themes available that looks pretty much like the one you attached an image of.
Google for "3 column theme wordpress" and I am sure you will find something that you can easily modify to your needs.
Welcome to the forum, ecameron.
I would remove the installation and redo it. If that doesn´t help, i would go and check out the G2 FAQ and read the Known issues section of the Readme, as your post indicates woul have info on this.