Text and ui samples

#1 The torque combat kit uses GUIText for creating text on-screen, and uses GUIBitmapButton and GUIButtonBase classes for the button objects. I just took these classes and put them in my game for the button objects.

Here's how I made one of my buttons for my main menu:

GUIBitmapButtonStyle buttonStyle = new GUIBitmapButtonStyle();
            buttonStyle.Focusable = true;
            buttonStyle.SizeToBitmap = true;
            buttonStyle.Anchor = AnchorFlags.All;

GUIBitmapButton startButton = new GUIBitmapButton();
            startButton.Style = buttonStyle;
            startButton.FocusOnWake = true;
            startButton.SelectedTexture = @"data\images\startHighlighted";
            startButton.NormalTexture = @"data\images\start";
            startButton.InputMap.BindAction(keyboardId, (int)Microsoft.Xna.Framework.Input.Keys.Enter, StartGame);
            startButton.Size = new SizeF(200, 50);
            startButton.Folder = this;
            startButton.Visible = true;
            startButton.Name = "startButton";
            startButton.Position = new Vector2(412, 550);

And here's how I made some Text:

GUITextStyle textStyle = new GUITextStyle();
            textStyle.SizeToText = true;
            textStyle.FontType = "arial12";
            textStyle.TextColor = Color.Black;
            textStyle.PreserveAspectRatio = false;
            textStyle.Anchor = AnchorFlags.All;
            textStyle.Alignment = TextAlignment.JustifyRight;

GUIText enterFuelText = new GUIText();
            enterFuelText.Visible = false;
            enterFuelText.Folder = sceneview;
            enterFuelText.Style = textStyle;
            enterFuelText.Position = new Vector2(512, 680);
            enterFuelText.Text = "Fuel load:";

#2 Now here is my question, say i make this text say game over or count how many lives the player has, where do i put these GUIText lines, and how do i implement them in the game? Do i have to put these in a seperate file and then referance them later or what? I dont understand this GUI thing at all, im used to the editor