The requirement of photography licensing may vary from one region to another. In most places, if you are a freelance photographer, you will not require a license to operate.
However, if you are a journalist or someone who takes commercial photos of special events, government seminars, or international media coverage, you may need to have a license to cover these events as these are private functions. These are specific certification programs that you may have to clean to get the photography permit. It depends on your country and the rule they have in place to get such licensing. A photography school can guide you better on how to apply for the permit, and will it require you to clear some certificate courses or not. Some of the other requirements will come with the license itself when you qualify for the permit.