You will have had your married and live together with your spouse for a minimum of, e.g., five years (every country has its time frame).
You will have to prove that you live together, show evidence if required (photographic), have a Job, and have a business, and you have enough means to support the family without relying on the state. This process is called Naturalization and is a very simple process, but when you make the application, you need to provide evidence of your stay with your partner/spouse and children if you have any.