I wish to write a letter to the head of the government organisation for a personal enquiry ie. about the career prospects after the postgraduate course that i am pursuing and ask for his guidance to decide a topic for my thesis. I can decide how to go about the letter. Awaiting reply.
Those are two big questions to ask someone who is apt to be very busy.
Ask one at a time. Ask for ideas for a thesis. Write your thesis first, then contact him and ask about a job.