The online documentation for administrators starts at http://docs.moodle.org/en/Administrator_documentation.
But, if you want to get up to speed quickly, I recommend Moodle Administration by Alex Büchner http://moodle.org/mod/data/view.php?d=55&rid=1942. That will take you through everything in a logical order.
Lounge
Moodle is installed....now what???
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