Is there a way to control the size and colour and weight of GUI text??
You can change the color by setting GUI.color before you call the GUI function. The size and font of the text can be changed by creating a GUISkin and customizing that.
cheers but im struggling where to find the font size in the gui skin
The size settings you want are for the Font asset itself.
Select the font in your project panel, and the settings should show in the inspector. You currently have to set it this way for GUI stuff as fonts are pre-rendered into cell sheets for fast rendering.
-Jeremy
Ive tried that but all the settings are greyed out, how can I change the font size?
Make a copy of the font file, right click on it, select Import Settings then change Font Size. Use the resized font in a new GUI Style.