Hello. You have a few options for transferring this file. First, you could put the file into iCloud Drive and then access it using your iPad. Alternatively, you could use AirDrop to send this file to your iPad. AirDrop uses Bluetooth and Wi-Fi to transfer files.
iCloud Drive is probably best if you plan on making frequent changes to your book between your Mac and iPad. This will help ensure that these changes are synced between your devices and you do not have to constantly send the file back and forth with AirDrop.