Quinceanera Invitations

Is there any website that shows how you can/should word the quinceanera invitations. Like what`s the proper way to word and put down on the invitation what the family wants on it without it looking too gaudy(sp?)? Hope you can help me out because a friend wants me to prepare some invitations for her friend and they really are asking for too much on the invitation itself. Plus its for two daughters, one who will be 15 and the other 14. So I really don`t know where to begin. So could you please help me out???