Dear Sir / Madam,
I would value the opportunity to be accepted for this project. I have been passionate about writing for a number of years which has included writing for various forms of media - editor of a magazine and having a book published are two examples.
I am competent and able to meet these project requirements for you. I am new to the site, as of yesterday, and therefore I am hungry to get my first positive review which will mean that I will work as hard for your company as you do.
I look forward to hearing from you.
Mark