I need to do some research before I can feel competent enough to write a story about an observant person who is sitting shiva. There are so many questions I have about what is permitted and what is not permitted. What I'm going to do is read a book called "Mourning in Halacha", which basically covers all of the issues. Then I can get to the writing.
But then, I could always do the parts of the story that I know are okay. Like visits from people, conversations on the phone that don't involve the character saying "Hello" or other greetings.... hm..