How much is a lesson?
It depends on your plan but a basic price for one private lesson costs US $30 for 60 minutes.
Do you recommend any textbook?
If you are a beginner, we recommend a textbook called "げんき".
Using "げんき" textbook, you are able to study ひらがな(Hiragana), カタカナ(Katakana), and 漢字(Kanji).
I want to live in Japan.
It's really good motivation. Japan is safe and convenient but it's hard to live if you can't speak Japanese.