i am an interior designer and i need help in writing an official letter to my client that before i start on doing the 3D designs..i need some commitment fee to start off with my work..please help put down in an official letter written

Hello there , how are you? So, the Head Master of my Health Department wants me to write a letter to him "an official letter" talking about my wishes and my dreams for my future career???? And I don't know what I should write or

from, <<information removed>> To, The Accounts Officer Bharat Sanchar nigam Ltd trivandrum telecom district Sir, Kindly allow me 20% deduction on my broadband bill of being a ex-service man.