When preparing the layout of my book, I didn’t want readers to keep flipping to the back of the book to find additional information as to where the chapter in question was researched or little snippets that enhanced the topic. I find it much more reader friendly if the information is there at their fingertips at the bottom of the page. The first option box in Indesign CC 2017 gives you the starting information to your footnotes. I preferred to separate the number with a tab before the footnote information. As usual you have to make a STYLE first and then incorporate the numbering and suffixes, which seems pretty straightforward.
The LAYOUT part of the box is down to your preference but I think a rule above the footnote equal to your line leading looks pleasing. The choice of allowing split footnotes to run over to the next page is good, although I only used it once, and would be mainly used on a double page spread, my next book could contain a few more as its about music biographies.
OK, if you find that you have finished your book and you want to revert all your footnotes to ENDNOTES, then there is a script by an all round good guy called Peter Kahrel which just does that. Take care though, at it does not keep the original footnote on your page, as it transfers them all to a designated endnote Indesign document.
http://www.kahrel.plus.com/indesign/footnotes is the link where you can also find conversion of static notes to dynamic ones. If you can spare a donation please do. I bought my book cover plug in off him earlier this year and it converts the Front Cover spread to a single jpeg file which we all need for uploading to kindle or any website.
INDESIGN UPDATE 2017CC. Footnotes have been updated to spread across double pages!! will come in handy for book layout staff