Honestly, I think there is some serious danger to depicting the pre-Children story of the Valar as straight history. The events of this part of the story are straight out of myth. Yes, the Valar are characters who interact with the elves (and some humans) historically later on. Valinor will be a setting for our elf-based story.
But. There is a *reason* the Ainulindale is so remote. It's supposed to be. Elves had access to eye-witnesses to these events, but the elves in Middle Earth are cut off from that access. By the time these stories make it to the 3rd Age, they are lore, matters of legend - not history.
If I were a producer on this project, I would be very tempted to say, "Great ideas, I like them. But let's start with season 2, and use the material you've developed for season 1 as backstory *as necessary* in the actual story - which is the history of the elves during the First Age."
If we began with the awakening of the elves at Cuivienen, we would get to Fingolfin much faster.
We would also preserve some of that feeling of 'depth' and there being more stories untold that Tolkien was so good at creating. There are very few unexplored vistas left when we detail the history of the Valar over the entire first season.