You’ll probably need to setup a larval rearing tank (a tank to raise the baby shrimp in), as the babies would be eaten by the fish in most tanks.
The thread I shared above recommends transferring the shrimp with the eggs into the larval rearing tank when the eggs change to a lighter color (which should be about 10 days after the eggs show up) and keeping the parent shrimp in that tank until it spawns. Once it has spawned and you have the baby shrimp, move the parent shrimp back to the normal tank.
For feeding, adult amphipods are probably too large for the baby shrimp to eat. Soyou feed the whole larval rearing tank brine shrimp nauplii (baby brine shrimp); there are some super simple brine shrimp hatcheries that can be used for this - searching here on the forum can find you a few different ones that work. If I recall correctly, the super long paper above tells how many baby brine shrimp per milliliter should be fed (prey/feed stocking density), but I don’t know how many off the top of my head.