Make GUI bigger and another font?

How Do I make my gui from this script bigger and compable with another font?

function OnGUI(){
GUI.Box  (Rect (Screen.width - 200,Screen.height-35,200,80), bulletsInMag.ToString(), "Ammo");
GUI.Label (Rect (Screen.width - 200,Screen.height-70,270,180), magsLeft.ToString(), "Ammo");
}

Sorry for noobie question

With a resize axe.

Change style with name “Ammo” in Inspector or programmatically.