If there are egg & larvae, either there is a queen, or a laying worker. If there are multiple eggs per cell and they are stuck to the sides and all over the cells (basically a mess compared to a normal queen that lays the egg standing up on the center of the bottom of the cell) you most likely have a laying worker. Either case, you need to get rid of whoever is laying before you can try to introduce a new queen.
If it is a laying worker, you can combine then via the newspaper method with another queen-right hive, or you can take the hive 20ft or more away and shake all the bees out and return the hive to it's normal place.