I need help adding in sounds for my players footsteps. I put two walking sounds in the player controller where it has the script for element 1 and 2, however the sound is extremely low and basically inaudible unless I turn my headset all the way up. Also is there an easy way to sync it with my footsteps and make different sounds for the surface I walk on? I saw many youtube tutorials for this but most of them are out dated or just hard to follow, I would also like to make the sound sort of fade whenever going underwater. I know this is asking for a lot but I just cant figure it out and I still barley know how to program 
The footsteps are probably quiet because you need to configure your AudioSource. Check the rolloff curve to see how far the AudioListener can be before the sound gets very quiet; it’s likely that your listener (probably attached to the main camera) is too far away with your current settings.
Are you making a 2D or 3D project? Techniques for syncing footsteps with animations vary. You will definitely need some scripting, too.
As for the water, you can apply a lowpass filter when your listener is under water for a very nice effect. I recommend using colliders to check whether your listener is under water for smaller bodies of water, but just a y-position check for large bodies.