• iBooks Author is a Mac OS application.
• iPad runs iBooks, which is an iOS app and used to read what you create with iBooks Author on a Mac.
See the Mac App Store for iBA requirements. What version OS X is on your MacBook?
You can't import iPhoto books or PDFs into iBooks Author. You would need to recreate that book from scratch in iBooks Author by first selecting an appropriate template and then using copy/paste to place your photos and any text, or just type the text in manually, etc.