Hi,
You just need to install the web project (or, basically you can create a copy of the production web project folder) and connect it to the same database and add appropriate license key. Then, you need to setup the
web farm synchronization (for a load balancer purpose, additional license is needed as well as new license key with web farm server support).
Since the new web project will be connected to the same DB, the data will be the same.
For the staging - you just need to stage the changes to one server in the farm only, the rest is synchronized by the web farm sync.
Best regards,
Juraj Ondrus