bow-- you should bow lower than he does..
but not too low... bowing is a sign of respect, and it is a signal to your status. Too low, and you are saying you are not to important!
he might just nod his head, you might just bow your whole head, or maybe even a bit with your shoulders.
watch others, and try to gage-- you shouldn't bow as low as the translater, but you should bow lower than, say your boss.
and think like a catholic school girl, feet flat on the floor, underneath you when you are seated.
in very formal occations, you might be asked is you want some tea, or something to drink. if you decline, your host will ask again, you should not decline more than twice.. (to accept the first time seems greed, to not accept at all, is rude!) but most times, since westerns don't know the fine points of declining, food or beverage is either there (at a place setting) or not served or offered..
and generally, some manner are accepted, even if not the manner of the culture.. (for instance burping at the table is perfectly acceptable for chinese. but if you don't know all the fine points of chinese manners, and don't use chop stick properly, but rather eat with fine western manners; and a knife and fork, don't burp at the table. Burping is not in keeping with western good manners!)
that's all i know..
