As you're interested in learning the Dutch language, you have probably noticed it's not easy to learn it to such a level that you can use it professionally. It's hard to find a Dutch language job and will probably take years before you reached the level ofproficiency needed so that the jobmarket will fully open up. In the mean time there are many agencies and websites specialized in offering English and multilingual jobs for non-Dutch natives.
Any of the large agencies offer multilingual departments, like Randstad, Adecco and Unique. There are also specialized agencies for native speakers such as Undutchables. And I myself offer multilingual recruitmentservices through http://www.careersinholland.com.
Next to a job board advertising multilingual vacancies in Holland, the site also offers lots of useful information. We have pages dedicated to work permit information, the jobmarket in general and specific info like how to write a good CV, taxation, salary levels and other employment conditions and benefits. As opposed to traditional job boards we also offer real personal support and service, so you can mail us any time if you have any questions and remarks. Thanks.