Looking at the official? Reddit API page it seems quite sparse.
In particular I can't like a description of the json files so I don't have to recreate them from scratch (is element x always null and if not what is the type it's supposed to be?).
Or an API for submitting stories on there.
Can anyone find any other sources of documentation or even long comments/example blog posts or do I have to go poking around the reddit API module or wrappers to learn more?
First, I assume you're already very familiar with the contents of the official Reddit wiki's API page.
After that, talklittle's reddit-is-fun wiki has useful information.
As for other things, I always just set up a network sniffer like Wireshark and just simulate what I want to be able to do in my program right on the website, the site itself runs off the api.py file so anything you want to do that is publicly do-able you should be able to just sniff from the site.