Spray an outline of the area where you would like to install the marble chips using landscaping spray paint.
Dig out the soil inside the outline to a depth of 6 inches using a shovel. Fill in the area with a 2-inch layer of pea gravel.
Pack down the pea gravel with a hand tamper. Strike the surface of the pea gravel evenly with the tamper to compact it.
Roll landscaping fabric over the pea gravel. Trim it to fit inside the space using a utility knife. The fabric will help block weeds from growing up under the marble.
Insert plastic edging around the edges of the area. Hammer the edging into the ground with a mallet until only the top edge is exposed above the ground level. Drive stakes at a slight downward angle through the edging near the bottom every 24 to 48 inches using a mallet.
Fill in the remaining depth of the area with marble chips. Rake over the surface of the chips to even out the surface using a bow rake.