Wind, ice slip

Scripting
1

How can I implement wind to make upper and sideway movement and ice slip for my player.Do I have to use forces? Or is another way cuz I have a charactercollider and to use forces I need to use a rigidbody

2

I add the rigidbody to my player, and the I put this code in a trigger.

var Player:Transform;
var slip=2;
static var onice=false;
function Start () {
	// Auto setup player as target through tags
	if (Player == null  GameObject.FindWithTag("Player"))
		Player = GameObject.FindWithTag("Player").transform;

}
function FixedUpdate () {
if (onice==true)
    Player.rigidbody.AddForce (Movementwii.moveDirection * slip);
}

But this is not working for some reason. What is wrong with this code?