Don't get your hopes up. Stomatopod larvae have only been reared successfully from the egg a few times. Brine shrimp nauplii don't seem to provide adequate nutrition. I have had limited success treating them with an additive such as Selco. Your greatest problem, however, is likely to come fromt the fact that the larvae are very cannibalistic. Most people who have had success rearing them have kept only one per container. That makes for a lot of work.
Assuming that you have a gonodactylid such as Neogonodactylus wennerae, the larvae remain with the female for about a week undergoing three molts. They do not feed during this time. After the fourth molt, they become attracted to light, swim out of the cavity and start feeding. Generally in a standard aquarium, they will starve to death in two or three days. If you can get them to feed, they will molt four more times and finally settle as postlarvae in a month. If you have O. sycllarus larvae, we don't know how long they stay in the plankton since they have never been reared. However, given the size at which they settle, it is probably atleast three months or more.
Roy