use the walkthroughs
Google "Zelda twilight princess game cube walkthrough"
Twilight Princess
its compass for your information... and you find the compass in a chest in Twilight princess
find the cannon and get shot out of it.
There is no way to get the Gale Boomerang without beating the minor boss in the forest temple (the monkey chief).
You can't so you have to find 4 monkeys and they will make a chain to get to that monkey. Then find three or four more to make a bigger chain to get to the boss.
Find the big key.
There is one in each dungeon.
You have to follow the monkey through the poison gas, protect her. When you're both all the way through she'll drop it and run away.
in the goron mines
In the first dungeon.. If you have a compass, you can find them easily