Hello! Welcome to the forums
I’m not really qualified, since I’m neither an HG or CoG author, but I’m working on a WiP now and I’m quite determined to get it published as a HG.
I would say that all the authors have their own styles and mannerisms, and there’s really no “cookie-cutter” approach to this. However, there are a ton of helpful guides to onboard aspiring writers like yourself!
This link is especially helpful: (wish I read this when I started heh)
The advice I would have is not to focus so much on the publishing of the game, for one, its a huge effort and once you start, it might be discouraging to constantly look at the big picture and keep yourself motivated. Instead, I think it would be great to focus on “small wins”, churn out chapter 1, and then chapter 2, and slowly build up from there.
Another thing would be to always leverage on the wonderful community here, curated by our super enthusiatic mods. There are a ton of amazing writers and experienced players here, so ask questions and trawl the forums extensively! Lots of answers here so just go check them out 
So for all I’ve said, just bite the bullet and do it! It’s going to be a crazy roller coaster, love hate relationship, sometimes you’ll question yourself like crazy, and sometimes you’ll be super proud of what you’re doing. Most importantly, focus on the small things and take it one step at a time!
All the best and I look forward to seeing your work! 