Hi Martyn,
My name's [Your Name]. I'm from [Your City, Your Country]. I'm [Your Age] years old. I'm a [Your Occupation, e.g., student] at [Your School Name].
I'm good at [What You're Good At, e.g., playing the guitar]. My favourite sports are [Your Favourite Sports, e.g., basketball and swimming].
What about you? Where are you from? What's your favourite sport?
Best regards, [Your Name]