How to make character Aim and shoot at HUD reticle

I’m not entirely sure I understood correctly but If you want the character’s rotation to be controlled by the camera when you aim (which is usually a wanted feature in TPS games) then you can have a look at this tutorial : TPS Build Part 2 - Character_BP Aiming - YouTube. The two CharacterMovement’s variables that are relevant to this are ‘Use Pawn Control Rotation’ and ‘Orient Rotation To Movement’.