Businesses must have the proper registrations, licenses or permits before they can legally open for business. Gov or call 786-315-2100 for further assistance.This is a checklist to guide you through the steps necessary for opening a business in The City. Concise guide to starting a business in Miami. Everything you need for Florida, federal, and Miami requirements all in one place. Miami Business County Requirements Property Visit the Permits website to find out what you need to get your building off the ground. Miami-Dade County Occupational License. Section 8A-171 of the Miami Dade County Code requires a County Occupational License in addition to the. You have to check on the zoning in your jurisdiction.