where have i went wrong in my script (unity 5)

hello, im trying to make a script for a simple flight control using torques (as im not aiming realism) and as this is unity 5 im super confused with what i'm doing since most of the scripts and guides i use might be older and is designed for unity 4, there is just some things i cant find an answer to make it work or atleast compile in my script, maybe someone could help me here

 #pragma strict
 
 public var pitch : float = 35f;
 public var bank : float =12f;
 public var yaw : float =3f;
 public var gturn : float =3f;
 
 
 
 //speed is more like thrust it seems, but meh too lazy to change any
     var speed : float;
     var speedincrease : float;
     var speeddecrease : float;
     var Maxspeed : int;
     var Minspeed : int;
     var Obj : Rigidbody;
 //for ground/air control (confused to where to put it)
     var taxi : GameObject;
     var rway : GameObject;
     var gnd : GameObject;
 
 
 function Start () {
 
     InvokeRepeating("Speed", .1, .1);
 }
 
 
 //taxi control (if it works -which doesnt)
 function OnCollisionEnter (col : Collision)
 {
 //aileron
     if (col.gameObject.name == var taxi )//use for the taxiway
     {
     if (Input.GetKey("right")){
     GetComponent.<Rigidbody>().AddTorque(-transform.forward * gturn );
     }
     if (Input.GetKey("left")){
     GetComponent.<Rigidbody>().AddTorque(transform.forward * gturn );
     }
 
 //rudder
     if (Input.GetKey("z")){
     GetComponent.<Rigidbody>().AddTorque(-transform.up * gturn );
     }
     if (Input.GetKey("c")){
     GetComponent.<Rigidbody>().AddTorque(transform.up * gturn );
     }
     }
 }
 
 //runway control (works only on runway, elevator should deploy at "certain" speed not implemented yet because im confused)
 function OnCollisionEnter (col : Collision)
 {
 //aileron
     if (col.gameObject.name == var rwar )//use for the runway
     {
     if (Input.GetKey("right")){
     GetComponent.<Rigidbody>().AddTorque(-transform.forward * gturn );
     }
     if (Input.GetKey("left")){
     GetComponent.<Rigidbody>().AddTorque(transform.forward * gturn );
     }
 //rudder
     if (Input.GetKey("z")){
     GetComponent.<Rigidbody>().AddTorque(-transform.up * gturn );
     }
     if (Input.GetKey("c")){
     GetComponent.<Rigidbody>().AddTorque(transform.up * gturn );
     }
 //elevators
     if (Input.GetKey("down")){
     GetComponent.<Rigidbody>().AddTorque(-transform.right * pitch );
     }
     if (Input.GetKey("up")){
     GetComponent.<Rigidbody>().AddTorque(transform.right* pitch );
     }
     }
 }
 //air control (if it works -which doesnt)
 function OnCollisionExit (col : Collision)//not colliding with the 2 object, aka taxi and runway to work
 {
 //elevators
     if (Input.GetKey("down")){
     GetComponent.<Rigidbody>().AddTorque(-transform.right * pitch );
     }
     if (Input.GetKey("up")){
     GetComponent.<Rigidbody>().AddTorque(transform.right* pitch );
     }
 //ailerons
     if (Input.GetKey("right")){
     GetComponent.<Rigidbody>().AddTorque(-transform.forward * bank );
     }
     if (Input.GetKey("left")){
     GetComponent.<Rigidbody>().AddTorque(transform.forward * bank );
     }
 //rudder
     if (Input.GetKey("z")){
     GetComponent.<Rigidbody>().AddTorque(-transform.up * yaw );
     }
     if (Input.GetKey("c")){
     GetComponent.<Rigidbody>().AddTorque(transform.up * yaw );
     }
 }
 //ends here currently, also placeholder and space, my head's steaming
    
 
 //something's missing here: speed limiter and speed=heading not momentum along with the speedo
 function Speed (){
 
 if (Input.GetKey("q")){
 Mathf.Repeat(1,Time.time);
     speed=speed+speedincrease;
     }
 if (Input.GetKey("a")){
 Mathf.Repeat(1,Time.time);
     speed=speed-speeddecrease;
     }
 }
 function Update () {
 
 var spd = Obj.velocity.magnitude;
 
     Obj.GetComponent.<Rigidbody>().AddRelativeForce(0,0,speed);
 
     if(Maxspeed<=speed){
     speed=Maxspeed;
     }else{
     speed=speed;
     }
     if(Minspeed>=speed){
     speed=Minspeed;
     }else{
     speed=speed;
     }
 }
 //currently end of the line, either i mix all the scripts or mix em in one big bag of mess