The current sense and status flag connections are optional, though monitoring of the status flag can allow detection of latched fault conditions. The status flag is an open-drain output, so multiple units can have their status flag pins wired together for applications where I/O pins are scarce and determining which motor driver is experiencing a fault condition is not necessary.
Note that the default state of the enable pin, EN, is LOW, which holds the chip in a low-current sleep mode. You will need to hold this pin high (either with an external connection or via the default-overriding jumper next to the pin) to allow the chip to run.