The fuzzy ones won't develop, that's fungus inside the egg. Remove them if you can.
Whereabouts do you have the eggs - in the original tank with the parents or have you moved them?
Some may develop faster than others, depends on the temperature where you living. Our so called warmer weather still hasn't arrived so our temps are about 18C on a good day dropping to 7C in the evening. They will develop faster if your temperature is warmer.
How many do you intend raising to keep (as it's your first time - if you intend keeping them) I'd suggest keeping about 20-30 to raise.