urbanite retaining wall

Hello

I'm considering to use old pavement stones to build a retaining wall in de garden off our holidayhouse in order for visitors to have a level grassfield so they can sit outside and I will also gain some more veg growing area + a clearer boudary as to how far they can consider 'private' eg non of my CSA members will go there.

Does anyone have experience in this? It would be concrete, flat stone, 30*30cm and ranging from 3 up to 6cm thick. And should hold back a max 1m ground level difference.

Allready figured out that 1 thickness for 1 layer could be a great starting point, but from there on, I don't know.
I would like to build it without extra cement and we have pure sand soil (the stuff you see in sand dunes) with some organic matter.

We are doing this now. We love it so much that we are trying to source more free urbanite for more walls. (We started with cement we broke up in the front yard.)

I have to say we hired someone to do it as it was beyond our skill set. They make it look simple. They are digging back into the slope at an angle and tamping down each layer of stone, wetting with water and adding dirt. It is taking more urbanite than we thought it would.