Be more careful how you want to approach this project due to the 'Medical' hint.
My 2cents are as follows:
Use ISO13485:2003 as guideline.
Map the company flow, who is doing what and how this is communicated.
Establish a 4-Tier documentation system (I used this approach several times successfully)
Tier 1 QSM
Tier 2 Procedures (Describing "What" needs to be done)
To make auditing easier, use the section out of the standard as your document numbers - if possible. (Can be up to 30 to 40 documents)
Tier 3 Work-Instructions (Describing "How" it is done)
Tier 4 Forms / Templates
When you review the existing documents, verify that the processes are still valid.
Maybe this can get you started.
PS. Keep your hair.