They are very easy to hatch, get yourself a small container with light aeration (use an air stone myself), room temp if your house temp is in the low 70's. Some First Bites, baby brine shrimp, decapsulated brine, walter worms basically anything for small fry. When you get your eggs there should be date on them of when to place them in water in the meantime store them in a cool dark place just don't forget them LOL. If you get more than one species be sure to mark your containers since alot of the females killifish are so similiar they are nearly impossible to tell apart.
Hope this helps