in the dark world go to where u saw the kid playin the flute and he will give a shovel to find it then transport ur self to the light world in that same place the area the kid was and dig around that area and u will find it

No, you need to beat Agnahim in hyrule castle. Then you need to beat the first dungeon. With the hammer get to your house (bomb house). Then go to the grove where the kid played the flute. Talk to him and he will say he wants to hear the song that he played one more time. He will give you the shovel. Warp to the real world and dig in the grove. You will find the flute. Go back and play the flute. He will turn into a tree. With the flute, in the real world play it right in front of the weathervane bird. It will become real. Now when you play the flute in the real world, a bird will take you to 8 points in the world. To get the ninth, you need to make the portal in death mountain which will take you to the 8th dungeon in the dark world.