StoryChief provides a number of standard fields when writing and publishing stories. Yet, it's possible that you might need additional fields for your articles.
Note that mapping Custom Fields with a blog/website requires some advanced API knowledge.
You don't necessarily need to connect all custom fields to your blog or website, but you can use them internally as well. E.g. setting the funnel stage of a Story, or indicate if the Story is translated or not, etc...