Get your 4 blocks of Iron.
Get one Jack O Lantern from anywhere in the world you were spawned on.
Put your 4 blocks in a cross with one on the bottom and three on the top.
Then put your Jack O Lantern on top of the middle block on top.
Then here you go! You have a strong good looking Iron Golem! Don't hurt him, because he won't hurt you! He protects you and your village! :)
Sometimes he will even give you and villagers flowers! Enjoy! ;)