Simple script porblem

How can I make a follow script for my AI system?I’ve made this code until now:

var size=10;
var player:Transform=player;

function Update () {
find_player();
}
	

function find_player()
{
var dist=Vector3.Distance(player.position,transform.position);
if(dist<10){
transform.LookAt(player);
follow();
}
}

function follow()
{
//Waiting for a response
}

So now enemy faces of the player,but how can it follow him?

Thanks!

transform.rigidbody.velocity.magnitude = x;

Thanks very much guy!!!