I need to start automation of FrameMaker, but run against walls everywhere

I use unstrutured FM 2022 (17) with Windows 11 and was asked to programme some variant publishing automation into it.

So I read some community articles, read about the FDK, theExtendScript Toolkit, and the FM DOM and about how to access the DOM via File > Script in FM. I installed all apps, but nothing is connected to anything else, or even not accessible (as the FDK which is installed but not available anywhere).

They're all standalone apps with no hint of how to connect them and transfer data from A to B.

And I found an "fdkinstallguide.pdf" from 02.2022 and also "fm-scripting-guide.pdf" from 09.2022. And the installation guide contains a download link that leads to error page, and  the giant guide with 1,000+ pages is also not helpful.

I honestly do not know how and where to start anymore.

Does anybody have a start-up link for me? Or can that issue only be solved by BUYING into a course offered by some Adobe Certified?

Thanks very much in advance!