1. Identify which documents need to be controlled
The first task is to identify which documents need to be controlled.
The most important rule of document control is that only current documents must be used for work. You may find that other documents are less vital and it may not be worth the effort of controlling them.
You may even decide to have different levels of document control for different types of documents, e.g. formal approval and controlled distribution for procedures and work instructions, controlled distribution for your list of legal requirements, etc.