如何使用Core Data构建我的模型对象

i am using Core Data for the first time in my iOS application. I am testing how it works, but i have some problems like this : I have 3 entities (Page, User, Note), my application is a book, a user can consult the pages and take notes, the user can take several notes in several pages. How i can organize the model of my objects in core Data and the relationships between my Objects. thanks.i am using Core Data for the first time in my i