Ted, you could opt for a race license from the KNWU (Royal Dutch Cycling Federation) which shouldn't cost too much. Then you can benefit from reduced fees (you'll pay a few euros) to enter training races and you'd get some sort of insurance every time you go out on your bike, providing you're training in your club's outfit.
In terms of cycling, there are few countries in the world as advantageous as NL. I'm sure there are plenty of WW members who can provide you with all sorts of information about cycling activities. Also, be sure to check out events such as e.g. the Amstel Gold Race for recreational riders. Then you can get a taste of what litle undulating terrain NL has to offer (albeit at the complete opposite side of the country from Den Helder about 200 miles away). It's also less windy over there.
Also, be sure to check out the island Texel, just a stone's throw and short ferry trip away from DH.
A GPS is handy to have. There are cycling paths everywhere and you can make full use of them if you know how to get back home. I might also be available if you just wanna go out riding for the time I'm in the country. In any case, I wish you a trouble-free preparation and a smooth transition in advance.