The Undying Lands

Does anyone have any information on the far green country? They call it the Undying Lands, but isn't it where the Elves have always dwelt? Does anyone think it may be possible that a source of power from Eru exists in this heaven-like country to make this everlasting life possible? Where do hobbits end up after they have passed away - would it be possible for Frodo to meet the Old Took in the Undying Lands?