you will need to make sure you have the 1.04 patch, avalible here, www.jediknightii.net
in the files section, or also at www.lucasarts.com
as for skins and models, well that depnds on what you like, and what the server has, if you play at a certian server all the time you might find out what they use for skins and such.
for models, i would suggest downloading ones that interest you and tryin them out with bots or finding server that use that mod. you can find third party software that classifies servers by mods, like, All Seeing Eye, or Qtracker.