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The only way in which Eberron play substantially differs from stock D&D play is that all PCs have action points. There are new races and classes and such, but you don't need to know them to simply play. Action points are detailed in the d20 modern srd, and you can read about them here.
thanks for the action point info are there any different stat adjustments for Valenar Elves, Because I was going to make a Valenar Elf monk for D&D day.
Note that there are several articles on the Valenar elves. Also note that elves don't follow the typical DnD pantheon, but instead worship the Undying Court. Interesting concept of undead animated from positive energy.