For reference, the address for the old Atlas Games forum, which is now a read-only archive, is forums.delphiforums.com/atlasgames . Many basic questions about Unknown Armies may already be answered there.
Also, these links may be of interest:
Official Unknown Armies webpage - atlas-games.com/unknownarmies/index.php
Unknown Armies FAQ - atlas-games.com/unknownarmies/uafaq.php