I have used these questions a couple of different ways. My students have used these questions while independently reading a book on their reading level and I have also used these questions during a book study when I read a chapter book out loud. I model how to use the questions with picture book or two. They catch on quickly and enjoy the questions. I encourage them to use various questions to keep their journals interesting and fun to do. If we do this during book study and I am reading the book aloud, we always start and end a reading session by sharing some details that they had written (either that day or the day prior). Once they get the idea of what I am wanting them to do (think & write while they are reading), they will ask to stray from these exact questions and I encourage that! As long as you can tell that they are comprehending what they are reading, the options are limitless.
One year I used it as a reading center. They were in their guided reading groups and they read a book on their own level and filled out a page in their journal Monday, Wednesday, & Friday. After they finished, they would place their journals in a bin and I would grade them daily. It really doesn't take long to look through them and leave any notes. My students LOVE it when I would add comments to what they wrote. Sometimes it would be a simple, "Me too!" or " I can't believe that happened! I wasn't expecting that!" Other times I just add a check mark so that they know that I saw what they had written for the day.
Hope your students enjoy it as much as mine do. I also have another sheet for Non-Fiction stories.