The normal way for KiCad to work is information created within the schematic is used to validate what is created in the PCB layout, by not having a schematic you are making life difficult for yourself and KiCad.
Have a read of this thread to understand some of the challenges that the development team have faced during the evolution of KiCad and why, in my opinion, you should try and make life easy for KiCad so you can get the best out of it.