Moving to Amsterdam from lovely Barcelona

Hi

I got a proposal from my company to move to our AMS branch located at airport area. I have to take a decision coming week and even it's a very interesting challenge I need to take into consideration several factors.
Can somebody advise me the monthly cost for a family with 3 kids (5 years old son & twins 1year old).
My calculations as follow:
- rental: i would like to bring my son to an english school Protected content . So that makes me look around Amstelveen or even Almere (any commet about Almere?) rental Protected content
- monthly family spend: Protected content (food/insurance/public transport)
- fuel:400eur
-others 500eur
Total aprox Protected content

Are above calculations accurate? Can do for much less?.....hope so

Eduard