How to write a letter asking for advice

So I’m wanting to have a career as a butler/footman and want to write a letter to the Butler and Footman department at Buckingham Palace asking for advice on which is the best route to get there. However, I am getting a bit stuck on how to word it. Here is what I have so far:

Dear Sir or Madam,

I am writing this letter to ask for advice on how to become a footman or butler as
I am interested in having a career in this field and my aspiration is to one day work at Buckingham Palace.
This summer, I left school with 8 qualifications including a GCSE in Hospitality at Grade B and I am now studying towards a diploma in Hospitality Management as well as an NVQ in Food and Drink Service at my local further education college.

Does that sound good? How can I improve or add to it? Thank you if you can help me