When the female deposits her eggs, the male will come by and fertilize. Within about 3-4 days, they will hatch and it will take another 3-4 days before they can actually swim.
Yes, you can boil an egg and use the egg yolk to feed the fry, but I personally think it's way too messy and really fouls up your water. Just get some first bites or crush up some flakes. It's just as good.