The Cisco FirePOWER 4100 series is a multi-purpose security services platform that can host either an ASA or FirePOWER Threat Defense (FTD) logical device. (One or the other but never both.) (It can also host a Radware VPro DDOS application but that is MUCH less common.)
Each respective image has its own Quick Start Guide, found here:
http://www.cisco.com/c/en/us/support/security/firepower-4100-series/products-installation-guides-list.html
The graphical interface you see when accessing the chassis via the dedicated management interface is known as FirePOWER Chassis Manager (FCM). It is used to manage primarily the physical appliance and to deploy the logical devices.
Once you deploy an ASA or FTD logical device, you assign physical interfaces (or create and assign Etherchannels) to it, enable them and then proceed to configure the logical devices via their own respective assigned management interface (generally NOT the appliance management interface although you can connect to a logical device command line via an ssh session the appliance.) Subinterface configuration would be within the logical device.
The procedure for deploying logical devices is covered in the FXOS FirePOWER Chassis Manager configuration Guide here:
http://www.cisco.com/c/en/us/td/docs/security/firepower/fxos/fxos211/web-config/b_GUI_ConfigGuide_FXOS_211/logical_devices.html
An ASA logical device is then configured as usual - via cli or ASDM.
An FTD logical device is configured via a local management utility (FirePOWER Device Manager or FDM) or remotely via a FirePOWER Management Center. The latter is the most common as FDM has some limitations.
You need to check the customer order to see which logical device type was specified. You will also need to register the chassis on the Cisoc Smart License portal in preparation for applying licenses to the logical device you install.
