Traditionally, the Japanese eat at a low table and sit on the floor. It is good etiquette to sit with your legs folded under you, but it is hard on the knees! You can also sit cross legged, but in either case, always keep your back straight in good posture! One should never crouch over the table.
Before eating, you say “itadakimasu”, which means “I gratefully receive”.
You will notice that Japanese style chopsticks are made from bamboo, and are tapered to a point at the end. They can be lacquered or not, smooth or slightly textured.