Actually I don't understand your question. Does "how to write" means "how to write with your computer"? Or do you want to learn "how the Japanese characters are"? If you want to learn Japanese, you have to memorize the Japanese characters, hiragana and katakana, then you can start from the basic grammar. Here are some website. http://www.nhk.or.jp/lesson/english/ http://www.guidetojapanese.org/learn/grammar http://www.learn-japanese-adventure.com/japanese-lessons.html http://study.u-biq.org/english.html There are many websites so, please find the one that is the best for you. Good luck! *If I understand wrong your question for my English, please tell me.