Dear Nick,
Thanks for your letter. I am very glad to hear from you. Also, I am very happy that you are okey in your new school.
As for your questions, my favourite dish is meat balls. My mum often cook them and always happy about this. I think in UK you something like this. Unfortunately I do not know the recipe, but I promise you to send it next time.
And tell me please about your favourite dish. Write as soon as possible.
With the best wishes,
Vasiliy Petrov