I'm new too, so I don't have a lot of knowledge to give, but one book that has made me feel a lot better is School Nursing: A Comprehensive Text by Janice Selekman. It has entire chapters about emergency readiness as well as chapters about how to respond to common complaints. For example, it will give information about stomachaches, the assessment you should do, questions you can ask, and the nursing interventions you can do. I highly recommend it!