You might take a look at
www.piloten.be or
www.eddh.de where you can find information about Dutch and Belgian fields.
In Holland I can recomend airfield Texel in the North
http://www.texelairport.nl/ and in the center of Holland Lelystad airport
http://www.lelystad-airport.nl/ you can find alot of info in the link section of the Texelairport homepage.
Lelystad is pretty close to Amsterdam so if you fly to Lelystad you can thereafter travel by train to Amsterdam in about 20 minutes. (cost aprox €15.- return ticket)
I'm Planning to go to England for the first time on the 22 of Oktober. It will be my first Channel crossing and i'm a bit nervous about it. I Have the Lifejackets but no raft since there is not enough room for that in the Katana DA20.
It is quite a long trip from Holland and I hope things wil go wel!