Oi, alright gather katon chakra into your gauntlet like you would with any kind of chakra and a kunai or sword. Instead of imbuing it throughout the gauntlet focus it into a single point and create a jet of flame that extends out from the gauntlet like a sword you'll have to perform extensive shape manipulation to form it into a scythe like blade. This Blade can be extended out from any solid part of the gauntlet and can be as long as a sword. When you cut someone with the blade it'll leave large searing wounds, it can easily cause deep lacerations and severe burns to the opponent. You have to pay constant attention on the shape and size of the blade so while in use you can only use Katon jutsu. Give it a shot.