OK, I've done my googling without much success...

I am a "trailing partner" and have a B-permit, i.e. I should have the right to work here.

As I am also househusband, I consider trying to get some consultancy work to have more flexibility than the regular 42h/wk. This could be here, but may well be in EU-land.

Any known legal hurdles to this? Do I have to register a business?

Tips and info very welcome.

TIA

Martin