Okay, I hacked this with Google Translate:
totale breedte = Total Width
totale hoogte = Total Height
The others get pretty useless and bizarre, so I’m not going to reprint them (though my personal favorite is “cross the board as far as the book block 3 mm. Whatever that actually means in Dutch and English would be another matter…)
Short answer: Don’t rely on Google Translate or on my knowledge of Dutch. Oh, and it’d be good to know what sort of book this is (the numbers might explain themselves better then).
I can tell you that setting page sizes would involve changing your document settings in “document presets > define” (in your File menu). You’ll likely want to adjust margins too (in the Layout menu under “margins and columns”). It looks by his numbers like he wants a larger book (picture/illustated?) book since A4 is not usually standard for book prints. I’m in the U.S., so I can’t comment on international book sizes, but A4 is unusual except for copy paper, isn’t it? Book sizes usually don’t match printer paper in the US, at least.