From Today..

I'm going to start learning Italian from a TV program. The new program starts today. exactly from tonight.

or you can say...The new program begins tonight. (はじまる）"exactly"をいりません。

そして、

Usually, there are no opportunities to listen to Italian in Japan.

or

Usually, in Japan, there are no opportunites to listen to Italian.
or もこれはいい。より明確であります。じつは、"in Japan"をいりません。

in Japan. So I decided to do so! I hope to do well!!

さあ、よくできましたね。かんばってください。(^_^)

From today..

I'm going to start learning Italian on the TV program. The new program is starting from today, exactly from tonight. Usually I have no chance to listen to Italian in Japan, so I decided to do so! I hope to do well!!

From Today

I'm going to start learning Italian from the TV program.This new program is starting today. Exactly from tonight. Usually I have no opportunity to listen Italian in Japan. So I decided to do so. I hope to do well!

がんばってくださいね！