Do you mean you want to be registered as self-employed? (Independant)?
You just need to contact your lacal desk of the BCE (Banque Carrefour des Entreprises):
They will screen your degrees, management and financial skills and if you pass, well, you will get a VAT number and a "Registre de Commerce".
Then you can launch your business from home.
But given the complexity of the Belgian fiscal laws, I do recommend you to hire an accountant. First of all!!
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