I think jiejie did a superb job outlining the essentials.

I would say it is essential to get Hep A and Hep B immunisations. For the latter, the standard course takes 6 months -- which you may not have. You can either opt for an 'accelerated schedule' (takes 2 months) -- offers very slightly less protection, but not massively so. Alternatively, start the course (first two shots, takes one month) and then take the last one in China -- will cost pennies, and will be safe, don't worry.

If you are staying in BJ or major cities, Japanese encephalitis not necessary. Rabies is present in BJ, but since one is in a major city one can access post-exposure care if necessary (our daughter has JEV, but we don't, and none of us have rabies). I would personally opt for typhoid (live) if possible -- protection is at least for 5 years and possibly longer, and typhoid is really nasty (although treatable), but agree it's not too common in BJ.

Although a year is not too long, I would definitely take two suitcases with me (and hand baggage). If you don't plan trips back to US before winter, packing some decent winter clothes is essential. You can buy a down jacket
here (pricey) if absolutely necessary though.

Once here, do join in with the random musings of the vibrant China board!

tb