Flag stones on to grass area
I have some flag stones that I want to lay in the back corner of my garden to use as a concrete base for a wendy house. I am going to lift all the grass at the weekend and was planning on just flattening the soil then laying them on top but on searching for tips, i've been scared off this method due to movement when raining etc...
So, some sites say use sharp sand then some polythene liner to put the flags on, others say use cement and then sand.
Could someone please tell me the simplest way to do this that doesnt involve renting cement mixers and huge rubber mallets which I would be able to do single handedly in one day.