Hello, Mark
Thank for your letter, I'm glad to get it.
My family and I are OK. I study, mum and dad work (если есть сестра/брат, напиши sister/brother study too). I am coming after this week, when my holiday will start. I am going to fly, because i like it. I will arrive at six p.m., I would be happy, if you met me. Yes, I want to go to the beach for a few days.
Well, I have to end this letter
Best wishes,
(имя своё)