Welcome to kokos ( and to goldfish eggs and fry!) Alfie.
There is a whole bundle of info you should maybe read up on in this forum on what to do now you have found eggs.
You will have to get the bad eggs out with a syringe or turkey blaster asap as fungus that attaches to those spreads fast to the good eggs.
As Heidi above says, the first few days the fry do not need feeding. They will not eat it. They must re-absorb their egg yolk and their sole objective in life is not to eat but to manage the long climb up the tank sides to the top of the water where they will be able to fill their air sacs with air. This is part of the formation of their inner organs that is crucial at the beginning. Weak fry who do not make it to the top will not survive. It is a good idea to have the water level low because of this. Most people suggest 5 or 6 inches is deep enough for fry.
When the fry begin to swim freely- zooming around the tank, this is when you will need to start feeding. The best food for best health and growth is baby brine shrimp and if you can hatch these yourself for them, even better!
You will need a sponge filter (no heater should be okay). The filter must be extremely gentle as fry are killed by strong current and will be sucked into regular heaters like pieces of food and debris are.
Fry are very sensitive to water quality. Ammonia
even at trace levels will kill fry- as will decaying food that produces bacteria and toxins. Fry must be raised in a cycled or seeded tank.
If you have any other Q's feel free to ask away. And Congratulations on your new babies

!!!!!