There are a number of different materials used to create a garden path including stone, brick, concrete, and gravel. The type of material you choose will determine how it is installed.
One approach is to place a plastic weed barrier or landscape fabric down first followed by a layer of gravel. In addition to blocking weeds, the barrier will keep the gravel from working into the soil. When using brick or concrete pavers, put down a layer of sand first, then lay out your desired pattern, and plant a ground cover between each of the pavers. Watch this video to find out more.