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Rename the folder "clientname".
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Rename clientname.info and edit to use the correct client name.
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Revise page.tpl.php to work for your specific layout. (Currently this file is identical to the original version pulled from modules/system/)
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Upload into sites/all/themes/
Default .info values: http://drupal.org/node/171206
Required regions: http://drupal.stackexchange.com/questions/16186/drupal-7-required-regions-for-a-theme
Drupal 7 theme cheat sheet: http://batayneh.me/sites/default/files/Drupal7-theming-cheatsheet_0.pdf
Drupal theme guide: http://drupal.org/documentation/theme