Oh yes... stupid me... this is a slackware forum.
Well how about start with install some Chinese fonts first?
Some great people at Taiwan had created CLE, Chinese Linux Environment, you can find CLE packages for Slackware 9.1 in here:
You can download and install all packages, but you probably don't need all if you just wants to display Chinese, read those .txt file for what each package do.
I'm sure you can get more help in their forum, http://www.slackware.org.tw
, as there's a Chinese Localisation section.