As has been pointed out, some form of immersion is best. If there's no community of Chinese folks near you, then you could try multimedia cds and some chinese shows/movies in the context that you'd like. This is important so that you'd get some essense of the Chinese language.
Then you can proceed on to books. Peter Falk has given some great advice. If you're intending to go to China or Taiwan, learn Mandarin and you can use the hanyu pinyin system to assist in reading Chinese characters. There are books in the market which deal with technical Chinese as well ie if you'd want to read up stuff on TCM, accupunture theory etc,,,
HTH