If you don't know how to get the fire arrows, here's help! Equip your bow to a c button as adult link of course! Warp to lake hylia and go the the little stone thing in the ground next to the giant tree. Take out your arrows when the sun is coming up. Right when the sun is coming up, not when it already is up, and when the sky is still red, shoot an arrow at the sun and you will get the fire arrows.