If you are talking about the Second Sage, go to Forest Haven, Get out your Grappling hook, and swing into the Water Fall with the Musical Notes coming out. Then, you will meet Makar. He has the Violin.
There is no violin in that Zelda game. Unless you mean the one that Makar has, YOU can't obtain it but you find him in the forest haven behind the waterfall, (you use your grappling hook to get in there) play the earth Gods lyric, then take him to the earth Temple.
It is no longer available in stores, try Amazon.
doorknobs.com
You can find a detailed walkthrough that'll help you with that on gamefaqs.com
Just off one of the islands where you deposit the orbs.
A person can find a detailed walkthrough for The Legend of Zelda: Wind Waker at several different places. Some of these places include GameStop, Zelda Universe, and Game Spy.
The Bokoblins in Zelda: The Wind Walker have their habitat in the Forsaken Fortress. However, they can go anywhere.
you have to find seeds of fire
She says she works on Dragonroost but really you can not find her
just look around until you find a fancy looking chest
The Triforce shards are hidden in the ocean. To find them you must have the Triforce Charts which will tell you where to find them in the ocean. When you have a chart and find the specific area it asks you to find, you can then reach into the ocean and retrieve it. Here is a very informative guide to finding all eight Triforce shards: http://www.gamefaqs.com/gamecube/469050-the-legend-of-zelda-the-wind-waker/faqs/42707
You first need to learn the Wind God's Aria from Gale Island, but in order for you to get inside, you will need the Iron boots from Ice Ring Isle. After you learn the song, you will be able to find Makar in the waterfall on Forest Haven