The females will carry the eggs underneath themselves near the abdomen it's the little white dots and when they hatch they will cling to her until they are big enough to leave her at about 5mm. For leaf litter you could just pull off some leaves and leave them in a container outside for a few days and it should be about right or you could just put in fresh leaves and it will decompose over time. The ideal temp for breeding is about 10-15 degrees centigrade as they don't heat themselves so you need to provide them with heat. You will also need to get LOADS as they breed once a year and have about 100 eggs so if you have 100 then at the end of the mating season you will have 10,000 woodlice

and they need soil about 5 cm deep as they will make under ground tunnels the leaf litter is to ensure that there are some above ground when you want to feed the toads.