Gui texturing for First load screen

After checking on the unity scripting guide, i am still confused of using the textures for button and with effects for rollover, rollout and all with background.

What i came to know about are the simple button scripts, but don’t know how to customize them and also the fonts, i know i am missing something but can’t find the proper way out.

Configuration of GUI.xxxx things is done through configuring the GUISkin you use.
If you never define it, its the integrated one which you can not alter. You first need to create a gui skin then you can modify its visual style for your needs
there are also 3 skins on the website to download, one beeing the default one

Can i have a reference of guiSkin how can i use it.