You're writing a work of fiction. Do you intend to get it published? If you do, publishers employ people called editors. Answering question such as this if one of the functions of editors. I have noticed some truly low standards in the quality of editing i have seen, so you might have to bring it specifically to the attention of your editor, should you ever be fortunate enough to have an editor. There are also such things as style manuals. I suggest that your first step should be to consult a style manual. Academic style manuals can safely be ignored--after the MLA, for example, does not publish short stories. The Chicago Manual of Style
is a very well-known and trusted publication. Please note thae although there is a free trial, they would expect you to pay to use their service regularly, just as they would expect you to by it in book form, rather than stealing it.
This is an online style manual i found in seconds with a web search.
Does it answer your question? I don't know--there's only so much i'll do for you, and holding your hand is not one of them.