The Network App retrieved from the marketplace will be containerized through Docker, thus you will only need to have installed Docker in your system and follow the deploy instructions provided with the Network App to ensure correct connection and communication with the 5GC NEF APIs, as well as a correct API exposure, to let vertical applications take advantage of the functionality exposed by the Network App bussiness APIs.
The Network App deployment is quick and easy, and it will only take you a few minutes at most.
Once you have your Network App correctly running, you will have to configure your vertical Applications to correctly consume the Network App business APIs, to take advantage of the functionality provided by the Network App.