I just want to ask somebody who has finished "you´re a legend" quest. Will you get a legendary item in some point of the game or you have to craft it ?
You'll have to craft it most of the time. I assume you're not going to be in for the long haul, so there's really no point trying to obtain droppable legendary items. Even if you were, crafting legendary items is still far less painful. Golden Garden set takes thousands of perception points and above to even have a fanciable chance. Panoptica set needs tens of thousands. ^^ Also, you can obtain items from dueling....that is if you can hit level 32 dueling and above!
So no, the easiest and most efficient way to obtain a legendary would still be to craft it. My advice is to go for raid based legendary crafts as it's more cost efficient than questing. My first legendary was SoCK, which is what most go for anyway. Useful guide over here.
I have noticed for a while that I only am shown the Legend and Level 30 quest while having had all of them some time back. I am awarded the Level 30 quest each time I have (re)loaded the page and gain a level and get the according sound to it.