Emulate conditions in the spring time..more light, warmer water. Feed small live foods, like daphnia, black worms, brine shrimp etc. The male will build a nest out of vegetation (we use java moss and duckweed) and a sticky thread-like substance that he makes in his kidneys. He'll turn black and try to lure and attract females into his nest. If a female likes the nest, she'll lay her eggs in the nest. The male will guard the eggs, pretty furiously. The eggs will take a few weeks to hatch.
Congrats on your fore into the world of sticklebacks. You'll love them, they're great fish to watch. They're related to seahorses...which I find interesting.