Work permits must be applied for by your employer in the Netherlands; in general, the employer must prove that the position cannot be filled by someone from within the EU before offering it to a non-EU citizen. Nationals from many countries must apply for a Temporary Entry Permit (MVV or Machtiging tot Voorlopig Verblijf). Citizens of EU countries and Switzerland are exempt.
You'll need to apply for temporary residence before an employer can ask for your work permit. The process should take five weeks; contact the Dutch embassy or consulate in your home country.
In the Netherlands, residency permits are issued by the Immigratie en Naturalisatiedienst (https://ind.nl). For more information on working in the Netherlands see www.werk.nl.