I added a example so you dont get confused, you go in a command block and type the command I give you. My example is herobrine, go in a command block and type this /summon Zombie ~ ~1 ~ {Equipment:[{Count:1,id:276,tag:{ench:[{id:16,lvl:4}]}},{Count:1,id:309,tag:{ench:[{id:34,lvl:3}]}},{Count:1,id:308,tag:{ench:[{id:7,lvl:2}]}},{Count:1,id:311,tag:{ench:[{id:0,lvl:3}]}},{Count:1,id:397,Damage:3,tag:{SkullOwner:MHF_Herobrine}}],CustomName:Herobrine,CustomNameVisible:1,Attributes:[{Name:generic.maxHealth,Base:100},{Name:generic.movementSpeed,Base:0.7},{Name:generic.attackDamage,Base:40},{Name:generic.followRange,Base:100},{Name:generic.knockbackResistance,Base:5}],DropChances:[0.9F,0.7F,0.9F,0.8F,0.2F]} and it will summon a herobrine like creature.
