This is a rather complicated process. First, go to the nether, find a fortress, kills tons of wither skeletons until you get three of their heads. Next, grab four soul sand. Place two soul sand on top of each other. Next, place the remaining two soul sand blocks on the top block on each side. Then, place the three heads on the three blocks forming a "T." Then, run. The wither is very powerful, so be prepared.
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Make a T of Soulsand, and put wither skeleton heads ontop
Use a spawn egg in creative or look for a nether fotress where they spawn.
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.
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.
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