Animation Wizard help?

So, I searched through minecraft file and took the ModelIronGolem.java (irongolem model) and uploaded it to MCreator to modify and it worked! Then a window popped up talking about an animation wizard and it gave me these animations to choose from (i have no clue what they are or what they do) : Head anim, left arm swing & right arm swing, left leg swing & right arm swing, left and right arm y axis swing, left and right arm z axis swing, left and right leg swing y and z axis etc. What do i do?!