my first advise is to give up on this idea. learn poi or something else. swords are way more difficult than anyone ever thinks, and don't look that impressive. Plus the burns.

If you don't get discouraged, post back and I'll give a few tips. I'm laid up with a broken collarbone, so I can post a lot of incoherent and loritab laced posts.

A friend of mine is experimenting with kevlar wick wrapped around a cheap katana (not quite a dime-store special, but close). The wick goes from the tip to about 6" from the hilt. He did a spiral wrap and secured it with copper wire. He's lit it up about a dozen times and has been experimenting with different fuels. The wick seems to have shrunk down a bit after the first few burns, making the wick fairly tight on the blade (we were concerned about the wicking flying off during a spin, no problem there so far).

After a little experince with it he said he probably wouldn't do the wire wrap again (he got a minor branding last weekend) but it was otherwise a useful tool to learn with. He seems to like a 50-50 mixture of white gas and lamp oil (outside performances only), it gives a good balance of light out put, wind resistance, and burn time.

Your milage may vary, but this avenue might be a good starting point for you to learn what you need in a fire sword. Remember this is just a starting point, and to keep the tip up so you don't lose arm hair.