Upvote:2
Well according to this link the normal procedure is to go to the Netherlands and the apply there to the IND there within 3 days. I'm not sure if I've missed something you need to do before that, I would have expected you to have to get something for your home country (as you imply) but I've looked around the official NL sites and can't see anything that says that -- if you have a link or other info please comment or update the question.
If you've been in the Netherlands for more than 3 days already you might need to go to a non Schengen country (i.e. the UK) and then re-enter the Netherlands and approach the IND. However it's worth phoning the IND, explaining the situation, and asking if you need to.
Basically I'd definitely contact the IND, contact details here.