Also, if you want to change the fontstring to an already established wow font you can use the following instead:
text:SetFontObject("GameFontNormalHuge")
This automatically uses a font style from the font file ( "Fonts\FRIZQT__.TTF" ) and size ( "20" ) with no outline but a yellowish color instead of white.
http://wow.gamepedia.com/API_FontInstance_SetFontObject