How to add Simple Free View Cam while walking


im new here and i have a little Problem.

How can i add a “Free First Person Looking Cam”?
Ive already have a First/Third Person Cam, but i want a cam who is active if i press “Left ALT”,
and only if i Press it, when i realese it, that should go back to the First/Third Person Cam.
The Cam should can free looking to left and right up to 120°.

Anyone have Ideas?

Thats my Cam Setup now:

upload image

**And btw ive got a another Problem with clibbing, my Character changes to the First Person View if
for Example a Zombie is behind me and the cam is much more in front as the other Cam.
Or i can make weird things, go down to the ground, or through.

Kind Regards