Hi Mr. Chris. You can actually set up a specific sidebar to a specific page. (but not to all pages) There is a plugin that can do that (set up to all pages) however, it is not compatible to the theme. You can set it up by the edit page. At the bottom, there is an option to choose between 3 layouts. (sidebar at the left, right and no sidebar). At the bottom of it, choose sidebar or a specific sidebar you want to put. To create a customize sidebar (so that you could see it in the widgets area, you have to create it using the add sidebar (sidebar tab) on theme options or the sidebars tab on dashboard.
Create new customize sidebar that can be visible to the widgets area.
Add widgets to the sample sidebar:
In the sample page, set up the specific sidebar for the page/post:
Set up the banner using html code: