the best way is just creating an environment thats 70-80 degrees, 95% or above humidity (sealed system) with floros for light. Just make sure your rockwool is not soaked, and that they get constant high humidity for the first week at least. i use a styrofoam cooler with painters plastic draped over the top and a floro on top of that. I raise the clones on a platform and have water under the platform so there is always water to evaporate. Once i put them in my chamber and mist them with a vitamin/light nute solution i dont have to check them until they are done a couple weeks later.