Change Camera - Aiming

Hello Everyone,
I would like to work on aiming, but i would like some guidance first from experts.

If i want to have 2 cameras in the game, one shoulder view and one close view (aiming),
should i add in both cameras character control script? Or should i just create the 2nd camera
and code in the character control script to accept both? Because the character control so far,
is working fine with main camera, but freeze when i set the 2nd on.

What would you advice me?

Thanks in advance