Semiologic Missing CSS Error

Please bear with me as I am new to WordPress.

I am getting a missing CSS error after I’ve uploaded Semiologic’s CMS pluggin. I loaded the entire contents of the ZIP file and maintained the directory structure:

themes/
———/plugins
———/themes
—————–/semiologic

Managed to complete the five minute intall but I’ve quickly become lost in how to get WordPress to look the way I want. I under stand the concepts of CSS and how to make changes to them but I can’t seem to get my head around how WordPress creates and organizes static pages and categories.

I would like to make WordPRess act more like a website CMS product then a blogging tool.

Has anyone thought to develop a plugin that would allow users to modify the CSS settings in WordPress with a browser based GUI?

Any assistance would be greatly appreciated.

Thanks