日本語授業

今日、日本語の授業が始まります。

( I think it's better to use a comma to make the sentence easy to read when there's a same letter in a row like "日" follows "日" in this case) 

日本語の授業の先生は日本人で、やさしい人です。

今がっきたくさん勉強するので、つぎの夏日本に行きたいです。

（するからorするので…the difference of them is I think ”から” is usually used in spoken language so "から" doesnt appear much as a written language. "ので” is usually used in written language. I feel that "ので” is more polite and soft. each of them has subtle nuance that I can't explain well...sorry.)

日本語頑張ってね☆:)