I am interested in replaceing walkways that go across the lawn, grass has just overgrown them and they were never built right. I want to put in a stone type walkway that sits in sand or cement. What is the best approach. How do I do this so the stones are not loose I picture about 6" to 12" stones fitted together with cement inbetween. How do I edge it to the lawn should it be slightly higher than the lawn so grass doesn't grow over it?