Check here whether you fulfil the conditions (such as age, nationality, etc.) to become an au pair in Belgium.
Find out what you need to take into account before arriving in Belgium (what documents you need, etc.)(as an EU citizen, as a non-EU citizen).
Which tasks can the host family expect from you? How much holiday are you entitled to? Who pays for your language course?
Do you have insurance coverage abroad? Will your driving licence remain valid? Do you need an au pair contract? What can you do for your safety?