Excellent thinking .This will ensure that you earn more passive income since you will earn beyond your own personal efforts.
The processes you outlined are great .You can test them out and see which one works best. You may even end up using a couple of the models.

My advice may be to start with getting an employee. In my thinking, a contractor or franchising comes with a bit more paper work and legal matters that may inhibit hitting the ground running asap. From getting the employee, you can then advance to the others.

You may also want to see if there are guidelines set in place by the body governing psychology practice in New Zealand. Some specialist fields come with their own requirements on how to engage others.

Hope this helps .