This is my code for First Person Tank Controls in Godot, it is hopefully very obviously incredibly basic, and only put up so that alternative methods to first person camera controls can be used and expanded upon

Any variables can be adjusted for comfort, the most important are

Sensitivity_X which controls left right look speed

Walk_Speed which is the speed at which you move forwards and backwards

Gravity which controls how fast you fall

Jump_Speed which is how much instant velocity is applied to the player

You need to tune both together to create the jump feel you want

This is the basic set up for creating the player I use