Businesses need to be aware of and comply with any applicable local, state, and federal regulations. For the City of Newark, consult the Revised General Ordinances of the City of Newark (otherwise known as the Newark Code).
To avoid misappropriating some other firm's name, you can search for Business Trade Names currently in use in Essex County, or use the Business Entity, Trade Name and Trade/Service Mark search provided by the New Jersey Division of Revenue's Business Records Service.
Search the New Jersey Administrative Code for specific state regulations or requirements for your business activity. You can also search the entire Code of Federal Regulations, which is the codification of the rules published by the executive departments and agencies of the Federal Government.
Finally, the Internal Revenue Service offers a Retail Industry Audit Technique Guide with advice on accounting issues.