How do i combine first and third person views?

Here's a list of steps that will get you started if you follow them correctly.

Have 1 camera as the main camera.

Have either 4 vector3s or 2 gameobjects that represent the First Person Position/Rotation & the Third Person Position/Rotation.

Make an enum or a bool to identify if the camera state is first person or third.

Make 2 functions one for first person & one for third.

In the functions Use Vector3.lerp & Quaternion.lerp to lerp between the positions & the rotations.

Use OnButtonDown switch the camera state.

& You're done :D.

Hopefully this helps, - Jabez.