Dear Sir/Madam,
My name is Rosemary Gosteli Dela Cruz, and I've been an English teacher for over 5 years now. I have also done copy-writing, editing and proof-reading work for over a year on oDesk (another freelancer site), which my employers were very happy with.
However, this is my first time here, and so I understand I have no feedback. As such, I would be willing to do the work and provide you with it to look over first (but watermarked, of course), and if you are unhappy with the quality provided we can cancel the contract with no hard feelings. I feel sure I can do excellent work, and if not then you naturally don't have to pay. I look forward to hearing from you.
Best Regards,
Rosemary Gosteli Dela Cruz