Dear Sir,
I writing to apply to your advertisement for an article writer.
Though I am a trained architect, writing is one of my hobbies. I have a number of unpublished novels. Being from an English speaking country, I have a good command of the English language. I am proficient in MS Word and, I am time conscious.
I believe that my skills and expertise are adequate to successfully execute this job to your utmost satisfaction.
I look forward to a positive reply.
Best Regards,
Paul.