Translation of Meereshöhe

I try to learn English as much as possible so that I can travel next year to the United States. I would agree to your proposal but I also need to find good teachers. My goal is quality and speed.
My correction were added and highlighted with yellow markers and attached to this email. Tell me now if you have any questions about grammar rules, since I was a teacher 10 years ago.
Right now the weather in Italy is very good. We have 25 degrees and the sun is not too hot. I'm going to swim with my brother, the sea is not far away. Wish you also a happy holiday.