You start in diagon alley in the quidditch shop. Buy Chudley-cannon's shirt. You must give it to Ron when you have bought it. He will give you a baseball card. Give it to the boy in the card shop. He gives you a wrongly printed card. Give it to the painter on the 6th floor in Hogwarts. The painter gives you a little spider. Give it to Hagrid. He gives you a necklace. Give it to Filch and he will give you a lockhart photo. Give it to the girl on the 3rd floor. She will give you a flashlight. Give it to the boy in the classroom on the 5th floor. He will give you a mouth organ. Give it to the boy in the music classroom. He will give you a whistle. Give it to the proffesor. He will give you the best armor in the game.