Unity 3d(Space) Questions

Hey everyone got some questions and yes I know Im total noob…

1. How can I improve my ship movement script? It seems a bit buggy when turning for some reason almost like bending space but its ok I guess…also how can I tilt the ship slightly when turning? I am going for a STO style ship control system thing.

   using UnityEngine;

   using System.Collections;

   public class ShipControl : MonoBehaviour {

     public Transform ship;
        float flyingSpeed = 0;
        float turnSpeed = 50.0f;
    
        void Update ()
        {
            //Accelerate the ship using the thrust key.
    
            if(Input.GetKeyDown("e"))
            {
                if(flyingSpeed == 0)
                {
                    flyingSpeed = 2.5f;
                    ship.transform.Translate(0,-flyingSpeed * Time.deltaTime,0);
                }
                
                if(flyingSpeed == 2.5f)
                {
                    flyingSpeed = 5f;
                    ship.transform.Translate(0,-flyingSpeed * Time.deltaTime,0);
                }
            }
    
            //Decelerate the ship using the thrust button.
    
            if(Input.GetKeyDown("q"))
            {
                if(flyingSpeed == 5f)
                {
                    flyingSpeed = 2.5f;
                }
    
                if(flyingSpeed == 2.5f)
                {
                    flyingSpeed = 0;
                }
            }
    
            if(Input.GetKey("w"))
            {
                ship.transform.Rotate(20.0f * Time.deltaTime, 0.0f, 0.0f);
            }
    
            if(Input.GetKey("s"))
            {
                ship.transform.Rotate(-20.0f * Time.deltaTime, 0.0f, 0.0f);
            }
    
            if(Input.GetKey("d"))
            {
                ship.transform.Rotate(0.0f, turnSpeed * Time.deltaTime, 0.0f * Time.deltaTime, Space.World); //and then turn the plane
            }
    
            if(Input.GetKey("a"))
            {
                ship.transform.Rotate(0.0f, -turnSpeed * Time.deltaTime, 0.0f * Time.deltaTime, Space.World); //and then turn the plane
            }
    
            ship.transform.Translate(0,-flyingSpeed * Time.deltaTime,0);
        }
    }
   
   

2. Edit: Solved!

3. Edit: Solved!

4. Is there a way I can make two ships collide by just making a collision sphere on both that detect each other? I don't need all the fancy physics, using transform for movement currently.