Unless you are prepared to set up a brackish water tank for at least a month, raising Amano shrimp isn't very practical. You can't just add salt to a tank, it has to be mixed up ahead of time, aerated for a day or two first, before being used to fill a tank or change water.
Eggs hatch soon after the female drops them, rising to the surface of the water. They become larvae, or zoeys, which require a month in brackish water with suitable food of minute sizes, such as cultured single cell algae or infusoria, to keep the larvae alive.
They will live up to four days in fresh water before they die, and they are hard to see. A light source helps attract them to one place where you can net them out.
After the month in brackish, if they live that long, they morph into shrimplets, which can then be transferred to fresh water, in a few stages. There are some sites with instructions on how to raise these shrimp and it has certainly been done. But it is not simple to do and takes preparation in advance to be able to supply foods the larvae can consume. A newly set up tank won't have anything in the water column they can eat. A mature tank will have some edibles, but not enough without supplementation.
