Surfing in the Netherlands (Amsterdam area)

Hi everyone, my job is currently taking me to Amsterdam every so often and I'm wondering if there are any recommendations for surf spots that would be easy to get to from the Schiphol area by taxi? Also, are there any surf shops near any of the choice areas? If nothing else, I would be happy just to try my first "international" spot since the opportunity may present itself.
If there are spots, what time of year and conditions can I expect?
If there are spots, what time of year and conditions can I expect?