Great - I hope you have fun. I've found Painflail on its own pretty useful for solo sessions with Solitary Defilement, for when the theatre of the mind becomes a bit too arduous, but I think it does really come into its own with the Quest expansion. You can adapt DNGNGEN or Solitary Defilement dungeons in minutes.
Remember you can also use the combat helper (for mobile or desktop) to really speed up the admin in combat: https://1d105.itch.io/painflail-combat-helper