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I have learned a little on this and I believe that he said he had "visions" in the woods. 
Hope it helped:)

Answer:

He didn't get ideas, the angel moroni came to him and spoke to him, telling him that he was going to dig up the book of mormon in th hill comorah( Ithink that's how you spell it). Joseph smith translated the book of mormon and was a prophet on this earth in the 1800's

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