Can anyone help me input bfxr sound files ( either .wav or .bfxrsound ) into Godot and how to use them???
Godot will not use .bfxrsound files but .wav files are fine. Drop them in your project and they'll be imported.
To use a sound file, you need to use an AudioStreamPlayer node. Drop your sound file in the "Stream" property and call play() on it in your game to play the sound.