Each province or territory except for Quebec establishes its legislation and policies on selecting nominees based on their economics. Therefore, the eligibility requirements for provincial nominee programs vary.
Usually, each provincial or territorial nominee program contains several streams/categories covering skilled workers, semi-skilled workers (National Occupational Classification code C or D), international graduates, entrepreneurs, and self-employed persons.
Depending on which stream/category you are eligible for, the application process also varies. For example, if you are eligible for a stream/category under Express Entry, you can only apply for a nomination when you are in the Express Entry pool and have received a letter of invitation from a province or territory. In other cases, you may apply for a nomination directly from the province or territory.