educational institution (University), so I want advice I started with
reading the mandatory documents & records but does it right to start with
that? and if not where should I start.
The first step is to do a GAP analysis, meaning to compare your current state with requirements of the standard. Identifying mandatory documents is only a part of this step but a very good one. So beside determining mandatory documents, I suggest you to do a GAP analysis and find out what other requirements you need to meet. Than you can make a project plan to fill in the gaps and make your department compliant with the standard.