Softimage Xsi: Razor Blade for spear help

Hey guys....im new to XSI and CGtalk....im tryin to make a spear like what you see in Soul Calibur 2 if any of you have played that...or Onimusha or something like that....Ive finished the modeling of the Rod and and stuff...but i dont know how to start out the blade for the spear...how do i start out? Can anyone give me a tutorial or somethin so i know how to make it perfect? Thanks a bunch guys...ive tried so many ways and it just doesnt work out for me...thanks again...bye


Attila