Image for Post Display in Sidebar

Hello All-

Let me begin by saying I am an absolute newb to wordpress design/development. I am experimenting with the gridlock theme in an attempt to recreate a site I designed a year or so back.

Here’s my issue / problem:

I’d like to have a post/page load and have the corresponding image display in a sidebar to the right of the main body. The original site is based on a three-column body layout – side nav (left), main body (center), and image sidebar (right).

I am not sure if this has been addressed in the forum thus far, if so, my apologies, I was unable to locate it.

I’ve been relatively successful up to this point porting the original site, but I am at a stand still at the moment. Any help/guidance would be greatly appreciate.