The next part of your quest is getting three pearls, and the first is Din's Pearl.
You will wake up on Windfall Island in a talking boat, the King of Red Lions. He will tell you how you need to save your sister (and the world), and advise you to depart. Unfortunately he has no sail, so you must get one.
Head through the stone arches by the docks. Follow the road until you see Zunari, a man in a parka, behind a counter. If you have 80 rupees, talk to him and buy what he sells. If not, head back on the wall behind the man and you'll find a little dock area. Break the pots for some rupees, and if that still isn't enough, go around slashing bushes on the island to get more rupees. When you get 80, buy the The Legend of Zelda: The Wind Waker/Item from the merchant.
After you buy the Sail, keep heading up the hill until you get to the stone building on the northwest area of the island. Open the wooden door on the building. Inside you will find a small man named Tingle who is locked up in a prison cell. Step on the nearby switch to free him, then go into the open cell. Pull the crate aside to find a secret passage. While avoiding the hazardous wooden floor sections, crawl through the passage until you get to the end. There you will find the The Legend of Zelda: The Wind Waker/Item.
Head back to the King of Red Lions and equip the Sail. Your new red friend will proceed to teach you how to sail.
After learning how to navigate the sea, set sail for Dragon Roost Island. Follow the wind, as it will lead you toward the large pillar-shaped island on the horizon. Occasionally you may find some rupees atop barrels, but it is mostly a boring, straight ride to Dragon Roost Island.
Second Play Through
You already have the color pictograph so you don't have to do pictograph missions, but you can do the photo shoots with the exception of two ladies gossiping and taking picture of the moon. You can't go on the second floor of Lenzo without the Deku Leaf and you need the day/night baton music for that other task.