Congratulations

If you don't have them already, you need to get the supplies to hatch baby
brine shrimp now. In a few days they'll be free swimming and need to be fed. I usually start right with baby brine, but a lot of people start with smaller food for the first week, and add the baby brine after. Do you have any live food cultures such as microworms or vinegar eels? If not, you can use a tiny amount of boiled egg yolk. I have never tried this, so you should probably google it and see how others do it, but from what I understand, normally you take a pinch, mix it in a small amount of water, and add a few drops to the tank. It's really easy to overfeed with it, which will foul the water and kill the fry so best to be very careful with amount.