well, i always been taking care of my cat's babies after she gave birth. Taking care of kitten is not easy because they always have their curious around. So, firstly i guess a cage with warming clothes will be good for them. 1-4 weeks kitten need their mommy's milk to get them stay healthy. so, since your situation, i think drinking milk powder for kittens are the best for them. Potty train is the hardest thing ever! Kitten that is young (1- 2 months old) doesn't know uses the sand. so, they always poop at anywhere that got corner side, for example, behind your house's door. So, if you want to train your kitten to use sand this is how you do. First, make sure you know how the kitten looks like when they want to poop. Normally, they will find their comfortable place to do their business. so, if you saw them looking around, take them to the sand. If they still trying to get out from the sand, strictly take them back to the sand. when you did this for a few weeks, the kitten will automatically went to the sand and do their business. However, it is very tiring because once you turn your head around, the kitten already do their business at the place that you don't like.