MongoDB 3.6.0 2008R2Plus SSL (64 bit) installed and running as service at start-up.

Config file is at C:\Program Files\MongoDB\Server\3.6\mongod.cfg and contains

systemLog:
  destination: file
  path: D:\MongoDB\log\mongod.log
storage:
  dbPath: D:\MongoDB\db
security:
  authorization: enabled

Data directory at D:\MongoDB\db and logs at D:\MongoDB\log

Admin user
user: mongoAdmin
pass:

db.grantRolesToUser("mongoAdmin",["root"])

To login to mongo from cmd line:
mongo --port 27017 -u "mongoAdmin" -p "" --authentionDatabase "admin"

To run the script to create databases and associated accounts for new users:
mongo createMongo.js --port 27017 -u "mongoAdmin" -p "" --authentionDatabase "admin"

createMongo.js:
var users = [student nums or similar here];

var curDB;
for(var i = 0; i < users.length; i++) {
  curDB = db.getSiblingDB(users[i]);
  curDB.exampleCollection.save( {test: "testValue"} );
  curDB = db.getSiblingDB("admin");
  curDB.createUser(
    {
      user: users[i],
      pwd: users[i],
      roles: [ { role: "readWrite", db: users[i] } ]
    }
  );
}