Basic letter phrases

I am new at this, and would like to find out some basic phrases in letters.

How are you?

Good bye for now.

I like emailing with you.

You are pretty.

You are cute.

Does "pokah" mean good bye?

Thank you very much

How are you?
Как дела?

Good bye for now.
А пока до свидания.

I like emailing with you.
Мне нравится переписываться с тобой.

You are pretty.
Ты красивая.

You are cute.
Ты милая.

Does "pokah" mean good bye?
Not always. It's slang. "Pokah" itself has also such meanings as: for the time being, for the time present, while, whilst, meanwhile

Note, that Al Polonski's translations of "You are pretty/cute" are said only to a female, you can't say it that way to a man.