Modifying a theme

[Argos]

http://www.websitebaker2.org/en/help/designer-guide/content-blocks.php

[Decclery]

I'm new to webdesign and I need some guidance
I found a theme DanFuh Dark 02 v0.1  and I think its great and i would like to use it.
I would like to make a slight change however.

I would like  to be able to place google ads in a block to the right hand side of the main content area and also under the search box area.

How do i go about creating a block to the right hand side of the main content?

Any help would be great