This is a part of The Complete Guide to Make your Own Wordpress Theme
A basic wordpress theme should have a header, navigation menu, content, sidebar and footer. This is illustrated in the image below:

Here lies your logo and usually, page or category navigation menu, and search box. It is also a common practive that google ads were placed here, so leave some space in the design to fit in the ads.
You should make 2 seperate design for the content area:
A sidebar should display important resources like category, recent posts, recent comment, blog roll and more. Some themes also put a search box at sidebar.
Here lies the copyright (eg: © 2009 zenverse , Powered by Wordpress) and link back to theme author.
Of course, you do not have to follow this old style. What we have discussed above is a very basic & plain theme. You can be creative, change their position, add more features and make your theme special. We will discuss the features you can add to your theme later.


Everything dynamic and very positively!
AlexAxe