1) What is the difference between a workplan system and a general system? Which one do I have to use for modelling a process plan for showing up in what order the product has to be assembled? 

2) Which of them do I have to use for work instructions later?

3) Are there any step-by-step showcases or examples? Unfortunately the Edu Space didn't really help me out...

Edu Process Planning ​​​​​​​