Landscape Design for Potential customer

I need a designer experienced in landscape design.
Our potential client is asking for "Wanting a design for front and back garden, looking to install fencing at front with garden / evergreen trees behind fence to block house a bit. Back garden redesign shed , to store wood look nice. And back garden lots of trees etc."

We are situated on the mid north coast of australia so knowledge of appropriate plants also required.

Would love to know what details are required to create something to potential client as part of quoting process and how much is the cost. Looking for a cheaper option than hiring local landscape designer.