Hello @Linds,
I am sorry for the delayed response, I was on an extended leave from my workplace until yesterday.
As for the workflow rules, I have studied official documentation quite intensively (also following all the links), this being the main source of wisdom.
Additionally I have also tried searching in this forum (this post looked promissing back then) as well as googling the internet, which would typically point to the same pages all over again.
Thank you for your effort in advance!
Best regards,
Marko