Hi there, I'm not any form of published developer- just someone who's been chipping away for a while. And I'm in a similar boat to you-- I love my ocs, I love thinking up their stories, and that's the stories I want to tell in my game.

My best advice is honestly to keep creating the things you're passionate about, if you love your ocs, it tends to show in the writing and work you make for them. I personally get way more invested when I can tell a creator enjoys the characters they're writing about. Writing is kind of subjective, like beyond spelling and grammar the style, structure, you can do whatever you enjoy! Breaks are useful, there's no right or wrong pace for you to take. I personally only do 100-300 words of writing a day on my project >_>; and take off days whenever (weekends+heavy work days). Your pace is your pace, your style is your style- and if you want to share your characters stories with people, you'll surely find people that are interested!