First notebook entry: Introducing myself

I am learning Japanese, because I am interested in a career in the movie industry.

My native language is English, and I grew up in the United States.

I enjoy working, reading, studying, attending university, and almost all sports. My wife is my closest friend. We've been married for almost 2 years, and we hope to have children someday.

私は映画業界でのキャリアに興味を持っていたので、私は、日本語を勉強しています。
# As the subject of the sentence is the same, you don't have to write '私は' again.

私の母国語は英語であり、私はアメリカで育ちました。
# you need to maintain coherence of your way of delivery. You started your writing in a polite manner, so you need to keep it in the rest of sentences.

私は、働いて読書、勉強、大学に通っており、ほとんどすべてのスポーツを楽しむことができます。私の妻は私の親友です。我々は、ほぼ2年間結婚して、私たちは、いつか子供を持つことを願ってきました。
私は働きながら大学に通い勉強していて、多くのスポーツも楽しんでいます。私は結婚してほぼ2年目で、妻は親友でもあります。私たちはいつか子供を持つことを願ってきました。

# This sentence is my suggestion.

Obviously, your Japanese skills are very high. Keep going, good luck!

Web camera! :D

Kyou, watashi wa webcamera wo kaimasu!
Kono webcamera wa Logitech C920 (desu). Sugoi!
1080HP!
(izenn ha) 100 doru deshita, demo kyou wa 80 doru!

Ureshii ureshii!

o→wo: when we use o, usually it will be regarded as a 'お' letter while wo will be regarded as 'を'.

(desu): in a colloquial way, you can omit the last part (here that is 'desu').
(izenn ha): in Japanese, いぜん は [以前 は], meaning 'before (that)'/'in the past'

Almost perfect, すごいです!! この調子(ちょうし)ですね。d(>_・ )

今日の天気

こんばんは　みんあさん。

こんばんは　みなさん。

今、ここで雨が降っています。　雨は今日まで10日間はこちらです。
今、こちらでは雨が降っています。今日まで10日間も(雨が)降り続いています。
→'ここ' is fine but 'こちら' sounds more sophisticated.
→it seems there is no verb in the second sentence though I can understand what you mean. '降り続く' is an expression combining two verbs, '降る' (fall/drop) and '続く' (continue / keep), so it means 'have been raining' (like keep raining). 

大変な時間ね。　太陽のヒートが慕っています。
大変長い期間です。太陽の熱が恋しいです。
→in this case (for a period), it is better to use 期間
→a little better to put '長い' because it is not so clear what is '大変'; however, it is not a must

→'ヒート' is not so commonly used. use 熱 instead
→when you say 'miss', perhaps '恋しい' is a good choice.

私は明日の天気は晴れたをねがいます。
明日は晴れるように願っています。
→in Japanese, often, subject of the sentence can be abbreviated since it is clear. here (私は)

→晴れた is the past form, use '晴れる' (present form) + 'よう/ように' (this makes the present verb a future form)

以上です。

It's amazing that you can use Kanji characters:) I'm very impressed with your Japanese skills! 

waa! kowai!

Dallas(*1) no tenki wa kowai desu! Waa!(*2)

*1 Dallas can be fine if you use alphabets in Japanese sentence.
*2 Waa is fine but personally I think kyaa is better to express the scared feeling.

(These are my suggestions)
1. In present tense
Darasu no tenki wa kowai desu. Kyaa! (;>_<;)

ダラス の 天気 は 怖い です！ きゃぁ！
           tenki   kowa
 
I can fully understand what you mean by your writing, good work:-)

Let me correct my English.  -__-
> Kanji letters and Hiragana letter for one word.
Kanji and Hiragana letters for one word.