Welcome, Ikgs!
I think we'll need more particulars: it depends on how big the plants are, and what kind of soil you are starting with. Spacing may also play a role.

Space out your 16 privet, after digging the ground over putting in plenty of compost, a bucket full per plant (2 wheelbarrows full). Dig a hole big enough for the roots of each plant, firm in with your feet, top dress with bonemeal, one handful per plant. Fork it lightly into the topsoil. Ball water if the soil is dry, 2 litres per plant.

Again, it depends on whether he is talking about 16 cuttings from a flat, or 16 12 liter containerized plants.