Please check out the Client edits section and do some searching for 'bladebuster'. Unless he deleted the guide it contained all sorts of info on how to create new items.
That being said it's not super complicated.
Copy an existing mesh (.c3 which basically creates the 3d shape for the item) and then the .dds texture files associated with it. Reskin it how you want and add it to the itemtype.dat and some other client side locations, add it to the server item list and you should be good to go.
There is SOME information on the forum about creating your own c3 files but it seems unlikely you are familiar with 3d model creation or anything of that level. I could be wrong but either way you will find most of your information in the client editing section + some searching.
best of luck
P4N