Can anyone check my letter?

Hi John,

Thank you for offering me the position of supervisor at your company.
Your really impressed me with your enthusiasm in the restaurant. I am sure that you can build up a success team and provide a pleasant working environment to the staffs. I wish I can achieve success under your guidance.
I have sent you my document, please see the attached.
Thank you again and I am looking forward to working with you.

Best regards,
Man

it this part any mistake???