I always use sphagnum moss for pullings now. You just need to keep the white end slightly buried but make sure light can still get to most of the pulling. For wetness, I basically follow the same rules as for plants, that is moist, but not wet nor dry. Some people say you can keep them covered with plastic wrap or in a ziploc bag to help them strike. I seem to do fine by putting them in sphagnum under florescent lights.