I am from CA. Beside your question, I would like to mention you to make sure your E&O insurance coverage. Property management usually is not covered in regular package. And another important thing is your trust account. Be careful, Keep all the daily belence records and invoices as both e-files and physical copy. Finally, I donot know if there is any rental control in NJ.
Licensing requirements for home inspectors in NJ are under the NJ Department of Community Affairs, Division of Housing.
I hope this helps! Good luck Dave!