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template:drupal_garland_blue shows the content of the following special named pages at the left, right and top:
top_navigation (displayed at the top)
default_sidebar_left (displayed at left)
default_sidebar_right (displayed at right)
<page>_sidebar_left (displayed only for <page> at left instead of the default_sidebar_left)
<page>_sidebar_right (displayed only for <page> at right instead of the default_sidebar_right)
<namespace>_sidebar_left (displayed for all pages of <namespace> at left, if no page with the same name exists)
<namespace>_sidebar_right (displayed for all pages of <namespace> at right, if no page with the same name exists)
In top_navigation you should use a bullet list of links, to create the navigation. You could create page specific top navigations too, if you adapt the tpl_functions.php a little bit.