How do I create noclip-esque flight movement?

A lot of the flight guides are basically the conventional flight mode, where you push two buttons to go up and down, and WASD to move Forward, Left, Backwards, and Right.

I’m looking to create one where you can look down, then hit W to move downwards. Or maybe, look down, and hit S to move upwards. Basically no-clip flight, but with collision.

I should also note, I’m working on the Third Person template.

Thanks in advance!