I would like to start build towers to protect the capital of the norse (being their troops sucks)
So I manage to get a nice amount of rocks, but the Mason won't convert them in cutstones.
Is there a way to tell him "Produce cutstones, I have to build towers!"
How can I make him produce cutstones?
This particular mechanic, I think, needs to be explained a bit better.
I'm going to copy-paste the explanation for this that I gave over at the Steam forums:
The cut-stone value isnt like, stone that's ALREADY been converted to cut-stone. It simply shows how much is AVAILABLE. With 22 stone, you CAN make 7 cut-stone, but it wont actually happen until some unit or effect needs it. It doesnt mean "Ok, you have 22 stone, and then you ALSO have 7 cut-stone over here that I already prepared for you", it's more like "Ok, you have 22 stone, so you have 7 potential cut-stone".
So in your situation, you need to first make sure you have a Stone Mason somewhere; if you already have one, then all you need is more actual rock. Get some more of that, and you'll have your cut stone.
Hope that helps. But yeah, it needs to be cleared up in the tutorial. It's a good mechanic but confusing to new players.