Cake crumbs for making cake pops need to have a fine texture to bind easily.
Make sure the filling flavor complements the flavor of the crumb.
Make sure the coating is not too thick to overpower the flavor and texture of cake pops.
Do not add more filling than needed or else it can break the cake pop and make them uneven from outside.
Add your decoration while the coating is still wet so it can stick properly and not fall down.