Elaboration for Question #2:
Divine magics come from the gods as gifts to their devout worshippers, granting clerics (and, to a lesser extent, paladins and rangers) powers that vary from healing allies to blasting enemies with holy fire called down from the sky. Arcane magic, wielded by sorcerers, is far more devastating than is divine (though it lacks the versatility of the cleric's healing and protective spells)
This was copied off of Wizards of the Coast, in the subdirectory of Licensed products/Pool of Radience: Ruins of Myth Drannor
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Larry, Sell-Sword to the OHF