Can you clarify what needs to go in the ini file when creating a mod.
The
Upload Guide explains to mod authors how to create a mod for the manager and has an attached INI file template that is commented.
(Anyone who wants to just make a mod they downloaded work with the modmanager see the first post in this thread.)
Do you need to put instructions for every file in the mod, so that it is copied? Can you use wildcards?
No, you just create an archive with the same folder/file structure you would copy to the game folder.
Did you need to consider saving original versions?
No, the modmanager takes care of backing up existing files when the mod gets activated.
Will it create directories that are implicitly required?
Yes. See the answer to your second question.