Letter to host family (please check for me)

I'm writing my first letter to my Japanese host family who will host me for two weeks in December. Could you please check this for me? :)


XYZ家のみなさんへ、
はじめまして。私はキャロラインといいます。今年の１２月にこうかんして、XYZ家のみなさんは私をせわをするそうです。ありがとうございます。
小形家のみなさんについてならいたいです。ですから、こうかんするまで、メールしましょう。
Email: _____
Address: _____
英語ができますか？私わ日本語にあまり上手じゃないですけど、がんばります。
メールをおくってください。楽しみに待っています。

English translation:
To the family of XYZ,
Nice to meet you. My name is Caroline. I am doing an exchange program in December this year and it seems that you will be taking care of me. Thank you very much.
I wish to know more about the XYZ family. So until I go on the exchange, lets mail each other.
Email: ____
Address: _____
Can you speak English? I'm not very good at Japanese, but I will try my best.
Please mail me. I'll be eagerly waiting for it.

I think your Japanese is better than my English.(^_^:)

今年の１２月にこうかん留学(りゅうがく)で、私はXYZ家のみなさんにおせわになります。ありがとうございます。
XYZ家のみなさんについてよく知(し)りたいです。ですから、その日(ひ)まで、メールしてください。

1.こうかんして こうかん留学(りゅうがく)で
more natural.
2.みなさんは私をせわをするそうです 私はみなさんにおせわになります
This part sounds very very rude.(lol
3.ならいたい よく知りたい
in this case, "know" is "知(し)る".
"よく" is "more/well".
4.こうかんするまで その日(ひ)まで
more natural.
5.メールしましょう メールしてください
more polite."please"

And XYZ家のみなさん is a bit tedious?
You can say みなさん only.

The second line:
今年の12月にこうかんして、XYZ家のみなさんは私をせわをするそうです。needs to be rephrased.

- We don't use just the word "koukan" for student exchange program, but "koukan ryugaku" (exchange STUDY) program to refer to these programs.
- Also, "...sou desu" (it seems...) sounds a bit too detached, so I would rephrase it as "I have heard..."
I might suggest something like:
今年の12月に、こうかんりゅうがくプログラムで、XYZ家のみなさんに　せわを　して　いただくと　ききました。
Under exchange program for December of this year, I have heard/been told that I would be under your care.

XYZ家のみなさんについて　ならいたいです。...needs to be changed a bit.
- Rather than "narau/naraimasu" (the verb "to learn (under someone, like an instructur)) I would simply say "I want to know more..." or "please tell me about...
XYZ家のみなさんについて　おしえてください。
- こうかんするまで　needs to be changed... for the same reason above. It sounds like "Until we swap" or something like that :) I would rephrase it as "until I go visit Japan" instead. Would you want to give it a try yourself to write this sentence in Japanese?

I am not correcting minor things here - if it's written too well, the family might assume that you are fluent in Japanese :)

The particle {wa} is written as は . Be careful not to spell 私わ .

Can you speak English?

You had better mean "Can we talk in English?" to sound asking of possibility, not of ability.
I would say:
英語でお話しできませんか？

it seems that you will be taking care of me.

To make this sense in Japanese, one who takes care should not be the Subject.
I would say:
みなさんの おせわになる と ききました [I have heard that I will be under the care of you].
The Subject " 私 " is hidden here.
With " 私 " as the Subject, you can use (XYZ の ) おせわになる or (XYZ に ) おせわいただく or (XYZ に ) せわをしていただく .
The latter two are more humble, but I think the first one おせわになるis enough here because it's already a polite expression.

__ する ようです [It is assumed that S do __ / S will do __];
__する そうです [I here (they say) S do __ / S will do __];
__し そうです [It looks that S will (soon) do __].
It is already scheduled that XYZ will take care of you, so the first two do not much the situation.
Be careful not to mix up the two ways of " そうです ".