work your way up to the boss defeat him and then you need to ring a bell at the top and a yellow light will appear. go in it to get to hyrule castle go to the basement to find the master sword.

to defeat gohdan in tower of the gods shoot arrows into his hands and eyes (i think) and when he's frozen toss a bomb into his mouth.

you absolutely have to shoot the boss's hands. im not totally sure about the eyes but i think u have to shoot those to.

once you get the statues to their spots and you have the big key go into the light and defeat the two armoses then go through the door once you use the bow on the blue things that blast you. Then go throgh the boss door. When you battle Gohdan, shoot the hand's eyes then shoot Gohdan's eyes twice once they open.Then toss a bomb into its mouth.Do this three times.Oh and when you are not battling Gohdan and you are stuck in the stuff before the boss battle,try looking at the eyes on the walls and shoot them with your arrows.

to past the tower of the gods you must complete all the rooms on the first floor. The entrance of the room to the gods will be open if the rooms are finished. When you enter you go to the room that is flashing. You must get the ancient statues to the main room. When you get the first statue to the main room, you will learn a song for your wind waker. Get all the statues and the entrance will open. One of the rooms to get the ancient statue has a bow and arrows. You will defeat the new enemy and get the idem. Get the big key by puting the statues and yourself on the three plats. When you get the big key, the statues will activate and you must defeat them. You use your bow at the eye and hit the red button at the back. The door will be open. Then you go to the room of the gods and challenge them. When you defeat them you will get to the top of the tower and ring the bell to open the entrance of the land of Hyrule.