XYZ Corporation is a small organization of roughly 20 to 30 employees working in a simple office space using basic peer-to-peer type networking in which all employees keep their data on their own PCs and each has his or her own devices (i.e., printers, scanners, and other peripherals).
In the last few months, XYZ developed a revolutionary widget that will change technology as we know it. The company received a substantial investment and will quickly ramp up to 100 employees. They moved into a new building that was wired and set up for a local area network (LAN). They have implemented a client-server-based network in which all printers, folders, and other resources are shared but everyone has access to everything and there is no security outside of the defaults in place when the system was set up.
TASK: Please provide a plan to provide secure Access Control Methods for all user access in the above scenario.