And then once you START writing, the magic happens. You make all the connections you hadn’t thought of, the characters become alive for you, story possibilities start opening up and maybe even exploding.
You can close your eyes and see it!
So really, starting writing should be the fun part.
You can always worry about paragraph breaks and commas or whatever at a later point.
As Hemingway said, write drunk, edit sober.
That doesn’t have to literally mean drunk. ;-)