how do i change text size?

I need a better version of this code or simply for the text to change size, font, color easier etcenter code here

 var originalWidth = 1366.0;  // define here the original resolution
 var originalHeight = 768.0; // you used to create the GUI contents 
 private var scale: Vector3;

 function OnGUI(){`enter code here`
 scale.x = Screen.width/originalWidth; // calculate hor scale
 scale.y = Screen.height/originalHeight; // calculate vert scale
 scale.z = 1;
 var svMat = GUI.matrix; // save current matrix
 // substitute matrix - only scale is altered from standard
 GUI.matrix = Matrix4x4.TRS(Vector3.zero, Quaternion.identity, scale);
 // draw your GUI controls here:
 GUI.contentColor = Color.yellow;
 GUI.Box(Rect(10,10,200,55), "Lawrence Mercieca's game test \n \n(PRE ALPHA TESTING PHASE)");
 GUI.Button(Rect(20, 680, 50, 30),bulletcount+" / "+magcount);
 if (rtext){
 GUI.Button(Rect(20, 720, 100, 30), "RELOADING");
 //...
 // restore matrix before returning
 GUI.matrix = svMat; // restore matrix
 }
 }