How do i import a large word document into Indesign CS6?

Having now created 2 books in InDesign (but in CC 2017 & now 2018), one 110 pages and the other 250 pages, with a new 3rd being 700+ pages, I have found it easiest to use the BOOK doc format (.indb file), which is confusingly named for newbies.  It actually strings together individual "books" with .indd suffix, that are each a chapter of the whole book.  You can then put unique headers for each chapter, for instance, very easily.  But you can create the individual chapters and then if you wish, use an .indb file to tie everything together.  When auto-streaming text, I've never had to create a text box/frame:  Maybe that was an older requirement but all I do is PLACE->Shift/Click in the first page (I use a Template to start with for each book-chapter) and InDesign creates as many pages as needed to suck in the .docx file (and I'm at Word v16.12 now), although I've never had more than 130 pages in the chapter.  Maybe my defaults have the correct frame, that I noticed someone suggested is needed.