It is compulsory that you register yourself with the local municipality as soon as you have taken up residence in Belgium. You should register yourself at least 8 days after your arrival in Belgium. Once you have given the municipality all the required information a neighbourhood officer will stop by your house to ensure that you actually live on that address.
Belgians have quite a strict administrational agency, and it is therefore of high importance that you respond timely to summons, letters or calls from the government or other authorities.
If you are an expat is important that you obtain in addition to your resident card a work permit. There are several types of work permits and each permit comes with different conditions. Of course, all jobs should be properly declared and comply with labour law. If you have your work permit, you must register as a job-seeker at your region’s employment office.