Use a spawn egg in creative or look for a nether fotress where they spawn.
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Make a T of Soulsand, and put wither skeleton heads ontop
Wither skeletons will only spawn in the Nether Fortresses. The Wither Skeletons are rare mobs that are only in the Nether, more specifically the Nether Fortress. Unlike regular skeletons the wither skeleton carries a sword and when hit by a Wither Skeleton you will be come infected by the wither effect.
its basically the same as the way you make a iron golem but instead of iron you put soul sand and instead of the pumpkin you put three wither skeleton heads on top of the soul sand
Technically, there is no real "end" to Minecraft, but you could count the defeat of the Ender Dragon as the furthest point in the game.
The recipe for the Wither Skeleton consists of four Soul Sand arranged in a 'T' position and three Wither Skulls placed on the three topmost blocks.