How can I load and position my sprites in c#?

I'm still trying to learn unity (latest 4.3.3) and coming from a monogame / xna C# background.

In monogame, I could simply run through a List and set each sprites updated position. Childs play.. In unity, this is proving to be an exercise in frustration and I know it has to be something really simple that Im missing..

I have the following in a c# script:

 public class Flake
 {
     public Sprite sprite;
 
     public int col { get; set; }
     public int row { get; set; }
     public float alpha { get; set; }
     public Vector2 pos { get; set; }
     public float scale { get; set; }
     public Vector2 velocity { get; set; }
 
     GameObject menuObject;
 
     Transform t;
 
 
     public Flake(Sprite spr, int c, int r, float a, Vector2 p, float s, Vector2 v)
     {
         col = c;
         row = r;
         alpha = a;
         pos = p;
         scale = s;
         velocity = v;
     }
 
     public void Update(float elapsed)
     {
         if (sprite == null)
             Debug.Log("null sprite!");
 
         alpha -= 45 * elapsed;
         alpha = Mathf.Clamp(alpha, 0, 255);
 
         scale -= 0.055f * elapsed;
         scale = Mathf.Clamp(scale, 0, 2.0f);
 
         pos += velocity * elapsed;
 
         t.localPosition = new Vector3(pos.x, 0, pos.y);
     }
 
 }

In another part of the main script, I am loading my sprites and creating a new "flake" and setting the sprite texture. This "seems" to be working fine.. the sprites are not null..

 public Sprite[] sprites;
 
 List<Flake> flakeList = new List<Flake>();
 
 sprites = Resources.LoadAll<Sprite>("Flakes");
 
 flakeList.Add(new Flake(this.sprites[Random.Range(0, this.sprites.GetLength(0) - 1)], 0, 0, 1, new Vector2(1, 1), 1, new Vector2(1, 1)));

Next, I want to update my sprites positions by calling their update and then this is where I am getting stuck. I have my sprite object, and I have tried playing with the renderer and transforms, but I can not figure out how to make the sprites actually display on the scene and update their positions. I would think its a simple:

 t.localPosition = new Vector3(pos.x, 0, pos.y);

But Im not getting it to work.. So how does one go about making these sprites appear and update their position on screen?? Do I need to instantiate a new gameobject for each? or ??

Any help would be greatly appreciated!

If you want to view the full script, its here: http://pastebin.com/9fqz2wVh
and the main part does derive from a monobehavior.. I dont want the Flake class to update itself really..