Re Survivor or Dementium style mechanics

Hey everyone, I was wondering if any one had advice or tutorial you could recommend to recreate the combat in Resident Evil: Survivor or Dead Aim or Dementium: The Ward? I have an idea for a survivor horror game and I wanting to try making the combat close to one those, like free look and click or hold lightgun style free look and firing a weapon like Resident Evil or have a pseudo lightgun aiming of Dementium where the crosshair isn’t lock completely.