Third Person Controller - Can't Move?

Hi! I'm trying to set up the third person controller with a few custom models, and I can't seem to move at all. I can rotate and that's pretty much it.

I removed all of the Animator components from the third person controller and scripts because they were set up for the default models. This shouldn't be affecting the movement though.

Here's how things are set up:

Also, I'm not getting any errors in the console when running the game.

Edit: another glitch I'm getting is when I press 'S' to go backwards (even though it won't move) the camera just rotates to face '0' then shakes profusely. This is another glitch I'm getting, but I'd prefer to get the forward movement fixed first.

Re:Edit: the issue with the camera shaking when trying to go backwards is because there's something going wrong with the camera portion of the thirdpersoncontroller that's causing it to not properly rotate when the player changes direction. I'll figure that one out later.