Hi longhair welcome to Holland
My experience in this industry showed me that experience was more appreciated then a certificate.
But this was in the late 90's, the economic situation was different.
You might take a look here : http://www.mikrocentrum.nl/cursus/cu...p?cursusid=772 ( I hope you already can read dutch ).
It might also be an idea to go to an employment buro ( is this good english ?) wich is specialized in technical jobs.
Maybe that with your experience they will pay for a course if they got work.
I can recommend "Connect uitzendbureau"
http://www.cu.nl/
succes,
Jeroen
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Jeroen