If you learn best by doing, download maybe the Zelda resource pack or the open source one (not sure how complete that is) and try making something like the intro pre-dungeons that Zelda has (Link to the Past's sewers, for example). Get the code to someone else's game (if they're on this forum, they'll probably help you understand it for references so you can learn stuff like making doors that open when you kill enemies, how switches and timers work, etc.
That's how I'd start, at least. And any specific questions you have, just ask on here, somebody usually can help you pretty quickly. Welcome to the forum : D