In principle, the early planning is a structured discussion trying to anticipate as much as possible of the editorial process from idea to publication.
Imagine a check-list you go through and adapt to your needs and context.
Learning from others is a good idea as they may have experienced situations you are not able to anticipate yourself.
Lecture: How to prepare a cross-border work plan (in pptx format and in pdf format).
On the CJC website, a variety of such check-lists is gathered – to enrich your discussion.