This is a conventional fire alarm panel. It came with an installation manual.
You need to get the installation manual and read the manual because it shows you how to connect the detectors, the pull stations, and the sounders.
Did you install the panel in the wall? Whoever installed the panel in the wall will have the installation manual. If they lost the installation manual, or need to keep the manual themselves, they are the ones that can get a new instruction manual from Notifier (the name of the company that made the panel).
The detectors and the pull stations are what cause the panel to sound the alarm. They send signals to the fire alarm panel, so they are input devices.
The sounders receive signals from the panel, so they are outputs from the panel.
The inputs to the panel are on separate loops. The outputs from the panel will be on separate loops.
You can get more information on the loop wiring by looking at:
Why Use Conventional Class B Wiring?
This wiring will be used for both the input and output wiring. Below the article itself is a button to get a free Class B Wiring diagram.
The drawings in the instruction manual will also show you how the loops should be wired.