Dear Sam,
I was really glad to hear from you. We haven't spoken in three months. How is your family?
About tennis, I think that the most important aspect when trying to learn to play is choosing a good instructor. The one that I found a few years ago was a true professional. It is because of him that I now know how and when to use the techniques that he taught me.
Secondly, you should buy good quality equipment (clothes and a suitable racket). When we both have time, I could go shopping with you and give you a few tips according to what you want.
We'll be in touch,
Your name