There is one in our backyard. Think of the letter S and stretch it way out. it slopes around one tree, winds around a bush (no longer there) and then to the other side of the yard. It's filled with random larger rocks about the size of your hand. One day I might put a decorative well out there and perhaps a bridge.
You can measure and do a drawing to scale on grid paper to scale or simply get the yellow spray paint made to mark utility lines that spray downward and draw out on yard sold at home depot. Or use hoses to do layout .
What a great project! See if these will help you.
Dig a large trench long then line it with rocks and stone at the bottom