aggressive mobs how to stop this

hello first sorry for my bad english :(

i have fun server and spawn custom mobs in hyjal
but when i attack one mob all odear mobs attack me
how can stop this can you help me this is very big problem for my
my player start level 1 and fight whit mobs level 1 but all this mobs attack them when the player hit first mob :(

Make the mobs not aggressive. Like so their names are yellow, that way they only attack when attacked. If you are using http://wow-v.com/create.php?tool=mob put it on neutral in the dropdown box.