online business - requirements

The first step is to register as an official freelance / independant at the BCE (Banque Carrefour des Entreprises).
http://economie.fgov.be/fr/entreprises/BCE/

Be aware that the Belgian Fisc compares the VAT and tax declarations of people selling items on:
- Facebook
- Ebay
- Kapaza
- etc...

They have extremely powerfull BI (Business Intelligence) software sending automatically alerts as soon a particular thershold of clues has been reached.

The Belgian is desperately loocking to find money...by any means