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to become uneven? If I don't use mortar between each piece of stone,
would it be at least desirable to have a mortar footing (instead of
sand)? or I should use sand below and put mortar between the stones?
(3) What is the best way to stack the stones where there is a slope?
I cannot create a sand base where it is sloping the steepest. Do I
have to shape the ground there like a series of steps? I think I have
to, but in that case, I would not be able to use a sand layer
underneath.



I would not use sand as the base. I suggest road fill (DGA), a mixture of
rock from 3/4" to dust which packs down nice and tight when tamped.