I see things like a movie, too! ;D If it’s writing advice you want, then I’m going to agree with everyone above: Just write!
Since you seem to envision things like I do, I might be able help a bit. Write exactly what you’re seeing down, and when I mean everything, I mean EVERYTHING. Word vomit all over the place, bro. When you feel like you’ve properly laid down what you’ve seen, go back and read it. You might think what you’ve written is terrible (whenever I reread things I write I’m like ‘wtf, potato, that isn’t even a real word’), but it doesn’t matter. Just edit the ever living crap out of it. There’s always at least one good paragraph. Sometimes what you write surprises even you c:
Other than that, I think skill with writing takes practice. Write, write, write! Oh, and read, too. Find authors you like and try to emulate them. I love to do that, and then pick and choose the parts of their styles I enjoy, and others I don’t (or suck at, haha) and then mush it into whatever I’m doing.
I suck at coding so I’m not even going to go there.
tl;dr word vomit everything you’re thinking. practice writing it’s a skill like any other.