I think you have misunderstood the purpose of this site. We don't do your homework for you. In fact, we don't help with homework at all. Do the best you can, submit the letter to your teacher and then, when you get it back with comments and corrections, come back to us if you don't understand any of it.
If this is your homework, no. As I said, we don't help with homework before you submit it. Your teachers wants to see how you write the letter, not how we can write it. Please note the amendments I made to your post. Remember to capitalise the first word of every sentence, always capitalise the word "I" and to use a single punctuation mark at the end of every sentence.
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