drupal-customization-with-zen-and-wysiwyg
Nobody wants to have their production site look exactly like a clone of the default theme, colors, logos, etc. (do they?)
Uploading nice looking content can be made a lot easier with a What You See is What You Get html editor (especially for inserting pics and graphics around text).
Download the Zen Theme and the wysiwyg api Module (this will also require image_assist)
In /sites/all create a sub folder called themes (or read the Zen README.txt)
Then upload your extracted Zen folder to the /sites/all/themes folder
Additionally upload your wysiwyg module to /modules or /sites/all
Administer -> Site building -> Themes
You'll be prompted to run cron manually (or you should be) so that the new options appear on the Drupal Menus.
After that choose to enable Zen and have it as Default... after a brief wait your site will reload with the new theme!
To create a "sub theme" (or a customized version of Zen) you should copy the zen folder and then rename it so that you have: /sites/all/themes/zen /sites/all/themes/subthemename
you might first create a 48x55 image to replace the logo.png and a 16x16 image (irfan is great for this) to save as an favicon.ico