[Answered] How can you set an animation to run based on certain functions or key presses?

I'm currently trying to create a 2D platformer game as a first project, but I'm having some trouble with the animating. I have a sprite created, and I have the actual animation; when I press Play on the Unity console, the player starts the running animation, and I can move around just fine. However, I would like to set it up so that on start, the player doesn't move, and will only animate when walking left or right. I will include my script so far, but if anyone needs to know any other information, feel free to ask. I will willingly provide screenshots, data, files, etc. to help.

 using UnityEngine;
 using System.Collections;
 
 public class NewMovement : MonoBehaviour {
 
     public Rigidbody2D rb;
     public float moveSpeed;
     public float jumpPower;
 
     private bool faceLeft = false;
     private bool moving = false;
 
     void Start () {
         gameObject.GetComponent<Rigidbody2D> ();
         faceLeft = false;
                   //I'm fairly certain that a bunch of the code has to be put in Start, so info is retrieved from the get-go.
     }
 
     void Movement() 
     { 
 
         Vector2 v =  GetComponent<Rigidbody2D>().velocity;
         if (Input.GetKey ("d")) 
         {
             v.x = moveSpeed;
             GetComponent<Rigidbody2D>().velocity = v;
             moving = true;
         }
 //Boolean values should be based off of the keys D and A; the sprite should only animate when one of those keys are pressed.
         else if (Input.GetKey ("a")) 
         {
             v.x = moveSpeed * -1.0f;
             GetComponent<Rigidbody2D>().velocity = v;
             moving = true;
         }
 
         else {
             v.x = 0.0f;
             GetComponent<Rigidbody2D>().velocity = v;
         }
 
         if (gameObject.transform.position.y <= -4.5) {
             if (Input.GetKeyDown ("w")) {
                 v.y = jumpPower;
                 GetComponent<Rigidbody2D> ().velocity = v;
             }
         }
     }
 
     void SpriteFlip ()
     {
 
         Vector2 face = GetComponent<Transform>().transform.localScale;
 
         if (Input.GetKeyDown ("a")) {
             if (!faceLeft){
 
                 face.x *= -1;
                 faceLeft = true;
                 GetComponent<Transform>().transform.localScale = face;
             }
         }
 
         if (Input.GetKeyDown ("d")) {
 
             if (faceLeft){
 
                 face.x *= -1;
                 faceLeft = false;
                 GetComponent<Transform>().transform.localScale = face;
             }
         }
     }
 
     void Animate()
     {
             //This is where the code will go for the animating, I hope.
     }
 
 
     void Update () 
     {
         Movement ();
         SpriteFlip ();
         Animate ();
     }
 }