A copyright notice is important because it informs the public that your book is protected by copyright, identifies the copyright owner (you), and shows the year of first publication. We will add a proper copyright notice to the copyright page in your book.
What about copyright registration? The U.S. Copyright Office states that copyright registration is voluntary. Copyright protection subsists from the time the work is created, i.e. copyright exists automatically when the work is created. Simply put: No registration or other action in the Copyright Office is required to secure copyright. There are some advantages to registering a copyright. If you wish to register your copyright, you may do so at the website for the U.S. Copyright Office. Filing takes a few minutes and only costs about $45.