Upvote:2
Here is the preface to the 2017 CSB: https://bibleversion.org/bible/versions/modern-english/christian-standard-bible-holman-csb/christian-standard-bible-preface-2017/
It contains sections on footnotes for OT, NT, and other footnotes as well. There is a direction to page 27 and an appendix of ancient versions used. Unfortunately I do not have a paper copy of the CSB and the online versions order the pages differently.
I hope this helps get you started.