I would imagine you will find it hard to find a site with a good cover letter writing template. But if you go to university career service websites, you should find some good guidelines on writing covering letters.
HI MATE YOU SHOULD PAY A VISIT TO eASON'S..have a look at book s on interview question and answers...that can tell you how to write a good CV as well as cover ltrs..you will need to chekc out the interview question from those books too.