Before of being Green Lantern he was a gifted genetics scientist in his homeplanet. He was trained by Lantern Ermy then he trained the Lantern Hal Jordan. When he trained Hal, Kilowog was tough and mean like a military drill sergeant.
He comes out in Green Lantern movie, Justice League, Green Lantern TAS.
equipment and power
Same as all the Green Lanterns flight, communication, forcefields, and create constructs out of his imagination