What can I expect to pay for landscaping in San Francisco?

My 500 sq ft backyard is on a 5% slope. The work will consist of leveling the soil, putting up retaining walls, and laying basic cobblestone. I’m not sure about draining requirements.

Approximately what can I expect to pay for labor and primarily what will the price depend on?

this job can run you between $6000-15000 depending on what materials are used and how long the wall is