No person shall engage either directly or indirectly in the business of a real estate broker, broker-salesperson, or salesperson, temporarily or otherwise, and no person shall advertise or represent himself as being authorized to act as a real estate broker, broker-salesperson, or salesperson, or to engage in any of the activities described in R.S. 45:15-3, without being licensed so to do as hereinafter provided.
N.J.S. § 45:15-1