From the plan, and documentation the project can start on production.
Determin if the project is better in one phase, or can be broken into several phases.
If the project is live a Staging/Dev clone should be used. Depending on the server all that would be needed is a database (MySQL) and the server file storage.
Backups can be used and tested to develope the Staging/Dev Project.
The backup must include the database along with all the files.
From the backups the project can be recreated as a sub-domain/sub-directory on the server.
It is recommended to have the project off-line to the public with only administrator access to both front and backend of the project.