Ok, I guess you'd like to create a mod. Well, you need a program that let's you extract Jedi Knight's recources, like ConMan or GOB Explorer. Then you can open Jedi Knight's .gob/.goo files (e.g. Jedi Knight\Resource\Res2.gob). Have a look at weap_saber.cog and try to change some things.
But seriously, learning to mod is not that easy. You need skills in very different areas, like programming (cog), modelling (3do), digital art (mat), 3d character animation (key), etc. If you are motivated enough to learn all these things, here are the resources:
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http://www.massassi.net/jkspecs/ Jedi Knight File Type and general innards reference
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http://www.massassi.net/tutorials.php Tutorials (mostly level editing, though)
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http://www.geocities.com/sabersdomain Datamaster (cog reference)
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http://jkhub.massassi.net JK editing hub
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