Maui,
You can hire staff just like any other
project. First hire a Permaculture Design graduate from the Permaculture Research Institute or another comparable program.
Have them develop the design, scope of work for multi-phase roll out, then bring on your project manager. From that point it is just like any other large program.
Or you can start small as permaculture suggests, working first with those areas you have the greatest level of knowledge. All depends on your timeline, desired outcome, and objectives.
It looks like
Sepp Holzer does these projects (for pay) based on case studies in the back of his book "Permaculture: A Practical Guide to Small Scale Integrated Farming and Gardening"
On my own property I addressed obvious erosion problems, implemented better
water management and started building beds in the process. For things I don't do well I bring in a contractor or consultant (mainly via their
books) relevant to my scale.
If you're business minded about this you need to have a five year plan. Especially if you'll be including an orchard or food forest. My wife has placed some requirements on me that everything must look really nice if it will be in the front
yard.
Be clear about what you want to accomplish before you hire anyone. If you are in south central Virginia (US) area, I can connect you with others doing permaculture who are in a position to hired on a consultative basis, however, with a good project plan you can do this with laborers.
Best,
Justin