How to change an objects position and rotation inside a script?

Hey I'm fairly new to unity so I don't know too much about scripting. I made this simple script for wood cutting where if the health of the tree reaches 0 it will play a random sound and start falling. The problem was that I done it with an animations so every other tree I cut would fly over to the first tree an start falling. How would I script it so that the tree would start falling over? I looked around and everything look very complicated, is there a simple way to do this?

Also as you can see when you cut the tree it will drop 3 planks, how do I put those 3 lines into one line. Lastly is there a way to make then tree drop a random amount between 1-3?

Thanks, I hope you guys can help! :)

Tree script:

 #pragma strict
 
 var Health = 100;
 var sounds : AudioClip[];
 var woodPlanks01 : Transform;
 var woodPlanks02 : Transform;
 var woodPlanks03 : Transform;
 
 
 function ApplyDammage (TheDammage : int)
 {
     Health -= TheDammage;
     
     if(Health <= 0)
     {
         Dead();
     }
 }
 
 function Dead()
 {
     if (audio.isPlaying) return;
     audio.clip = sounds[Random.Range(0,sounds.length)];
     audio.Play();
     collider.enabled = false;
     Instantiate(woodPlanks01, transform.position, Quaternion.identity);
     Instantiate(woodPlanks02, transform.position, Quaternion.identity);
     Instantiate(woodPlanks03, transform.position, Quaternion.identity);
     animation.Play("TreeFalling");
     yield WaitForSeconds(10);
     Destroy (gameObject);
 }