First, the game need to have a starting page where you have "start" before entering the game and settings where you could see the controls, and if possible you could make the controls adjust to the players needs. 2nd within the setting, must include the camera sensitivity if possible, for the player to control the speed of the viewing rotation to their preferences. Lastly, when the player was about "shoot" there should an aim cursor, where the player could hit the "target" .
Extra: It would be better if you could create a mode where the player can see themselves to change their view of shooting. from front view to wide view.