Many people have varying methods that work for them which is the important part.
If you have what is termed NORTHERN erectus as opposed to the more commonly SOLD IN TRADE SOUTHERN erectus then the fry will be pelagic and need probably enriched rotifers to start, with small copepods a beneficial addition to the starting food. After a week to ten days you can switch to enriched artemia nauplii.
After that, it basically depends on how fast they grow, and each individual batch can differ, as to when to wean them onto frozen mysis.
If you have Southern erectus then the benthic fry can be started right off with enriched artemia nauplii.
I've never had Northern erectus fry, but the reidi fry I raised are VERY similar in their needs.
You don't have much time to prepare as even from egg transfer, the gestation period is most likely to AVERAGE around 17 days. Many times, the male releases what we call "warning fry or babies" the day before the major release. Usually release occurs early before lights come on or very shortly after.
Bacteria is the biggest killer so extreme cleanliness works best, even more so that with the adults.
Keep temperatures in the 68° to 74°F range to help retard bacteria influence.