It's normal for the first eggs of the season to be odd in one way or another, shape, size, no yolk, no shell etc, especially from young Hens. Sometimes it takes them a few tries before their reproductive systems are in sync and they lay perfect eggs. Keep checking the eggs (cracking them open), and when you see normal fertile eggs with a bullseye, then I'd start collecting for incubating.
I try not to store collected eggs past the 10 day mark of the oldest egg, but sometimes you can get away with 14-16 days. I collect eggs at least twice a day (don't let them get too cold, for too long if your outside temps are low), mark the date on them, put them in paper egg cartons, keep them in a cool (55-60 degrees) dark place (like a closet, in an unheated bedroom) and turn/tilt them at least once a day (I usually elevate one end of the cartons up on a book or 2, then alternate the ends when I bring in fresh collected eggs). Let them come to room temp for several hours before setting them.
Also, the Hens should have free choice to a layer feed and oyster shell.
What kind of incubator did you get?
