拝啓(haikei) at the first.
敬具(keigu) at the last.
and other opening and closing words(english like),
for your respecter. It remind me of shoujo manga.
sinainaru her/his name
anatano your name
At first sentence, you put some season related word
We see signs of spring here and there.
The rainy season began at last.
How are you getting along in this hot summer? I hope you are quite well.
At final Greetings, you wish her/his happiness and health.
And more infomation,
Expressions used in Japanese Letters - How to write Japanese letters