In General the plastic hatcheries aren't very good, For Hatching an icecream tub with an airstone would suffice. Then you could move them into a breeding net or better yet their own Tank. You will not have to feed them for the first 48-72 hours(not quite sure of exact time) as they will still be absorbing their eggsac, Then you can Feed them Liquifry until it is possible for you to get a microworm culture, A few breeders suggest that even if you have a microworm culture ready that to feed them liquifry for the first 4-5 days to a week because the microworm may be a little too big and could cause digestive problems. I am not an expert so in no way is what I say gospel but you can use it as you like. We have a few experience breeders on here so they will be able to pick up on anything i forget to say, unless they have posted before I have been able to.
and what do i feed them once they hatch? 
