I agree with AI Dad, I personally soak my rockwool plugs in PH 6.0 water that is preparing for nutes. Then after soaking overnight I take plug in hand and swing in downward motion until all water that flings off is not doing so, rockwool has an amazing water retention ability, but you do not want it to retain too much water or it will rot seed. Fine balance! Then I insert seed 1/4" into plug, set on a plate and cover with a clear tupperware lid. Since you want to promote some humididty, keeping temp "comfortable" is key. Use your cp monitor if you want (AI Dad other post reference)! Personally I germinate in rockwool for my hydro starts unless clones of course as I do not like the paper towel method, and use Light Warrior for "dirt" grows.
However, if you ask 20 different growers how they do it, you will find 20 different responses each having his or her own successes. The key is to find what works for you and expound upon that by utilizing an awesome resource like this website to make your harvest better each time!
Best of luck and keep on keepin' on