How do I start? Does anyone know any websites or something to start learning Japanese? I'm not sure where or how to start..Would learning something like pinyin be helpful?

How do you address someone? I've heard that using last names is the proper way to address someone? and also, I'm not sure, but is there certain ending to the name such as '-san.' I really am very uncertain about this..I apologize for not knowing..

What is the difference between Cantonese and Mandarin?