Go to your local municipal building and usually the construction office or code enforcement will have the necessary paperwork you need to fill out & tell you what fees you need to pay in order to schedule an inspection. They will also check to see if you have any open building permits. Most towns will not schedule a CO inspection until all permits are approved and closed out.
Obtaining a certificate of Occupancy is just a matter of picking up an application and paying for it at the building department but do you have the smoke detectors and carbon monoxide detectors in place. Are you familiar with what is involved in the procesws. Getting your home properly prepared to pass the C of O will take more time than picking up the application. If you need assistance I am located in Upper Montclair best of luck
Simply call your township building. Most townships have the application and what they will look for on their website. You may just need a fire cert from your local fire company. But start with the township and they will guide you.
Good luck. Call anytime if you need more help.
856 905 2966 cell