"I hope this is clear enough for you to understand that the purpose of this letter is to inform you that I have decided to accept your offer of employment as a teacher at your school. I am very grateful for the opportunity and look forward to starting my new role soon. Please let me know if there are any further steps I need to take or documents I need to submit before my start date. Thank you again for considering me for this position. I look forward to hearing from you soon. Sincerely, [Name]