Just adding a few things to Brad @ Roaring Mouse's helpful reply:
InDesign was released in 2000 to replace PageMaker (which could no longer be updated and modernized), and pulled in features from PageMaker, Quark and FrameMaker.
It originally included the same document- and book-level controls that you know from PageMaker but has been adding features over the past 25 years to make our layout work faster and easier than it ever was in PageMaker. I have specialized in long document layout since the late 80s, and I would not want to return to the more limited feature set in PageMaker. That said, with additional features comes a learning curve—you can OCR the PDF in Acrobat, export out the copy, clean up the file and edit it in Word and then use File > Place (just like PageMaker!) to add the content into an InDesign document—but then you will need to set aside some time to come up to speed on InDesign.
In particular, be sure to read up on parent pages (Pm's master pages), including linked parent pages (not in Pm), primary frames (not in Pm), paragraph and character styles (like Pm). The book window is similar to Pm's book window, as is file management within the book window. InDesign also supports running header/footer variables to pull content (like titles) into the running heads automatically (not in Pm), and automatic cross-references to help the reader navigate (not in Pm).
There are a number of old Pm users helping out on this forum. If you get stuck, just ask us.
~Barb
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