I like to lay leaves on the soil without burying any part of them. Usually I put down a thin layer of chunky pumice around them to keep them in place, but there is no advantage to burying the leaf. You will see that when the new rosettes sprout at the base of the leaves, they are accompanied by a new set of roots which grow downward into the soil, actually pulling the base of the leaf to soil level and anchoring it pretty firmly down there.
When I root leaves I just water well along with my other succulents, when the soil goes dry. It's simpler and easier that way unless you're really good at guessing soil moisture in the intermediate range. The baby rosettes that sprout from the base of the leaves will be completely dependent on the leaf for their water and nutrients until they sprout roots and those roots go a reasonable distance into the soil. They will not be able to use the water in the soil until that point, so there's no benefit to keeping the soil wet. In fact there is a relative risk of the leaf rotting before it has had a chance to sprout a new rosette. So keep it simple, and water well when dry.
Lots of light is important at this stage (indoors that would be right next to a sunny window, ideally). Outdoors that would be out of direct overhead sun, maybe in bright shade or filtered light, bearing in mind the water supply for the baby plants is limited to what's in the starting leaf for a good while.
Do not try to remove or manipulate the baby sprouts until the new rosette is roughly the size of the original leaf, or a bit bigger. They're fragile when really small. Let them fill up the space they already have before you consider a new pot.