Transitional Genomes

Imagine an initial genome that was entirely RNA based i.e. an RNA world scenario. Ignore for the moment some problematic issues it entails but instead focus on the transition to a DNA based genome. Ignore too some legitimate but distracting side issues in order to consider on the following questions. Did that initial transition genome come replete with genes enabling the translation of helicases, DNA and RNA polymerases, topoisomerases and SSB proteins? More generally did that inital DNA genome, that putatively came via the RNA route, have a full complement of function enabling genes? What is the scientific basis for believing blind forces of nature generated this circumstance?