1) Make it a mini-series. Spreading the storyline out across, say, ten or twelve episodes, allows for some flexibility in the storytelling without falling into the trap of trying to cram too much story in the too little screentime of a film.
2) Do not directly adapt the storyline of any one game. None of the games have the narrative pacing or plot necessary to be translated into a TV series. It should be an original affair that adapts characters, settings, and themes, but the plot should be entirely original.
2) There is no Link. The concept of the Link, a time traveling warriors who appears in times of need and then vanishes, is (probably) a legend passed down from parent to child as a great darkness skirts around Hyrule's borders.
3) Ganon is already in power. Treat his conquering of Hyrule as a past tense scenario. Dedicate some screentime to the more rational Ganon that's only ever been hinted at in the games. Maybe he's trying to mediate a livable situation between the monster races of Hyrule, the Gerudo, and the native Hylians. If he's treated as a megalomaniac, he isn't interesting as a villain.
4) Zelda is the protagonist. Make her closer in spirit to the likes of Tetra and the Princess Zelda of Breath of the Wild. The series needs at least one compelling lead to carry the story, and the vaguely mystical princess who stands off to the side and offers bland advice is not it.
