You need to put a cord on it is all, they are normally hard wired for commercial applications.
You take a cord any 3 prong cord like a computer power cord or extension cord or whatever. You cut the end off that doesn't plug in the wall. You strip the insulation off that end of all three wires. You take those wires and connect to the three wires coming out the back of the light, black to black, white to white, ground to ground with three wire nuts....
That is all.
It's complete with everything including the bulb and ballast, just need cord. Wire nuts are nice too...