[NekoNekoChan]

Why would you want to cut food with your chopsticks? Oh, and again, don't stab food, ever. Especially a bowl of rice. Don't even do it at your homecountry(chances are the cooks and workers will be japanese, and could very well be offended, disgusted by you)
And as kuroneko mentioned, dont pass from chopstick to chopstick.

As for table manners, theres this, and then there is:
Slurp, and try to slurp/eat in harmony with the others with you.
When eating sushi, do not put a ton of stuff on it. It is disrespectful to the chef.
Do not put stuff in your white rice. Disrespectful.
Also, thank the appropriate people before and after the meal.
Chopsticks go a certain way on the table but I don't remember which way. Also, if your in japan, and your in a place that does not have western sitting, sit according to your gender. Meaning, dont sit like a girl if your a guy, and don't sit in a casual way. I can't really explain the ways of sitting through text, so you'll have to get that info elsewhere.