how to write a cover letter

some idiot thought that by sending out random emails (with his cv and a cover letter) to business contacts he can get a job. below is the letter.

Dear Sir/Madam,

My name is Ahmad Tawalbeh.I am a mechanical engineering student at Mo`ta University. Never the less I have postponed studying this semester due to personal circumstances. I am seeking a job.I`m a hard worker and ambition. I have good English, I also have good people skills and have experience in teaching. And am welling to work under pressure.

Attached is my C.V.

Thank you for taking the time to read my letter.

Sincerely yours,

Ahmad Tawalbeh.