Wiki implementation in the IT department

Today, examining a bunch of documentation and instructions, our technical department, I realized that sooner or later, the documents scattered in folders on shared disks are constantly updated with new information. With the advent of new tasks for the department, this information no longer fits into the logic of sorting old folders, and it is very difficult for a new person to quickly find the documentation he needs. And then I remembered from the WiKi technology ... and realized what a powerful tool gives us a hand !!! but unfortunately I have no experience of its implementation. To this end, and created this post. Refer to people who have experience of implementing WiKi in a large technical department. I would like to hear your recommendations and advice.
UPD!
Thought more about the issue of integration in AD! will relieve unnecessary problems and employees.