What I do to sprout seeds is take a piece of paper towel fold it up a few times. Wet it with warm tap water and place seed in paper towel, fold paper towel over the seed so there's good contact with the seed. Now place that on a Styrofoam plate, put another plate over top to create a dome. Now find a warm spot in your house and place the plate for 1-2 days. I've used my TV, hot water heater, and propane stove. The pilot burner from the stove is always on keeping my seedling warm n moist constantly. Works every time for me.
Once your seed sprouts and has a tail about an inch you can put that into the rockwool and put under a light.
Hope this helps.