It was the combination of Sakura and Chiyo (his grandmother)
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The one who killed Sasori was Chiyo (using the puppets he made when he was a child. Those puppets looked like his parents).
Orochimaru wasn't killed, just sealed. This is the start of Orochimaru and Sasuke's fight, continue reading till he is sealed. Copy and paste the link below to read the manga in english http://www.onemanga.com/Naruto/343/14/
Sasori is from the Sand Village.
Scorpion (Sasori)
No, he was the first to be killed in Akatsuki... so... i guess not. lol Well, technically, he wasn't the first to die, he was just the first shown to die. He is not the strongest( I believe) but he is not the weakest either. I know he is not weakest because of Deidara saying that sasori was stronger than him.