I have to write formal letter to my mentor describing why am I writing this course, reason for taking the course, writing background, strength and

I have to write formal letter to my mentor describing why am I writing this course, reason for taking the course, writing background, strength and weakness as writer, my hope to gain from the course and career aspiration. Can you help me find sample letters pertain to this.

Dear Sir,I am particularly interested in joining as role of Writer. I got to know about thecourse through your advertisement.I have more than 3 years of experience with reputed B-school of India...