@jgmac1106 If you're as poor a theme tinkerer as I am but about to embark on adding microformats to a theme, I might recommend taking a look at the individual commit changes that David Shanske goes through in converting the base Twenty Sixteen Theme into a more IndieWeb friendly theme. The list of commits with useful labels can be found here: https:/
I would recommend starting at the bottom and then slowly reading your way to the top to try to understand what he's doing in each section. Note that there are one or two places where he splits a particular change up between a few commits or occasionally backtracks. There's also a section in which he "rips" out the WP core functionality of Post Formats in favor of using the Post Kinds Plugin--I'd recommend you don't do this to make your resultant theme the most flexible. I believe there's also a section in which he adds a "comment walker" and later removes it because the experimentaly functionality was later merged into the Webmentions/Semantic Linkbacks plugin to better handle comments, so you can safely ignore may of those chunks which are now stable.
I suspect that between this and the code models for SemPress and Independent Publisher (which should also have some David Shanske specific commits and related discussion that you can look up) you may be somewhat better off.
Good luck! We're all cheering for you!